Revision History for A052710
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#9 by N. J. A. Sloane at Tue Apr 18 07:04:02 EDT 2017
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INRIA Algorithms Project, <a href="http://algoecs.inria.fr/ecsservices/ecsstructure?searchType=1&service=Search&searchTermsnbr=665">Encyclopedia of Combinatorial Structures 665</a>
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Discussion
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| Tue Apr 18
| 07:04
| OEIS Server: https://oeis.org/edit/global/2632
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#8 by Charles R Greathouse IV at Thu Dec 01 11:32:11 EST 2011
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INRIA Algorithms Project, <a href="http://algo.inria.fr/binecs/encyclopediaecs?SearchsearchType=1&service=ECSnbSearch&argsearchsearchTerms=665">Encyclopedia of Combinatorial Structures 665</a>
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Discussion
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| Thu Dec 01
| 11:32
| OEIS Server: https://oeis.org/edit/global/103
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#7 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010
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INRIA Algorithms Project, <a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=665">Encyclopedia of Combinatorial Structures 665</a>
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| KEYWORD
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easy,nonn,new
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#6 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006
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| FORMULA
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Recurrence: {a(1)=0,, a(2)=0,, a(4)=1,, a(3)=0,, a(5)=4,, a(6)=14,(, (2304-4608*n-36864*n^2+73728*n^3)*a(n)+(46368+121536*n+59904*n^2-9216*n^3)*a(n+1)+(-79800-56512*n+59520*n^2+34048*n^3)*a(n+2)+(200516*n+185964+68544*n^2+7456*n^3)*a(n+3)+(-15024*n^2-22732*n+6864-2228*n^3)*a(n+4)+(-217*n^3-2604*n^2-10199*n-13020)*a(n+5)}
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| KEYWORD
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easy,nonn,new
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#5 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004
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| MAPLE
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spec:= [ := [S, {C=Prod(B, B), S=Prod(C, C), B=Union(S, C, Z)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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| KEYWORD
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easy,nonn,new
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#4 by N. J. A. Sloane at Thu Feb 19 03:00:00 EST 2004
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| MAPLE
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spec:= [S, {C=Prod(B, B), S=Prod(C, C), B=Union(S, C, Z)}, unlabelledunlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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| KEYWORD
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easy,nonn,new
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#3 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003
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| LINKS
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<INRIA Algorithms Project, <a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=665">Encyclopedia of Combinatorial Structures 665</a>
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| MAPLE
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spec:= [S, {C=Prod(B, B), S=Prod(C, C), B=Union(S, C, Z)}, unlabelled]:]: seq(combstruct[count](spec, size=n), ), n=0..20);
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| KEYWORD
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easy,nonn,new
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| AUTHOR
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encyclopedia@(AT)pommard.inria.fr, Jan 25 2000
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#2 by N. J. A. Sloane at Sat Jul 22 03:00:00 EDT 2000
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| LINKS
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<a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=665">ECSEncyclopedia of Combinatorial Structures 665</a>
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| KEYWORD
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easy,nonn,new
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#1 by N. J. A. Sloane at Mon May 08 03:00:00 EDT 2000
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| NAME
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A simple context-free grammar.
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| DATA
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0, 0, 0, 0, 1, 4, 14, 52, 201, 792, 3168, 12844, 52676, 218148, 910996, 3832072, 16222352, 69061200, 295477550, 1269863304, 5479456290
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| OFFSET
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0,6
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| LINKS
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<a href="http://algo.inria.fr/bin/encyclopedia?Search=ECSnb&argsearch=665">ECS 665</a>
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| FORMULA
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G.f.: RootOf(-_Z+_Z^4+_Z^2+x)-RootOf(-_Z+_Z^4+_Z^2+x)^2-x
Recurrence: {a(1)=0,a(2)=0,a(4)=1,a(3)=0,a(5)=4,a(6)=14,(2304-4608*n-36864*n^2+73728*n^3)*a(n)+(46368+121536*n+59904*n^2-9216*n^3)*a(n+1)+(-79800-56512*n+59520*n^2+34048*n^3)*a(n+2)+(200516*n+185964+68544*n^2+7456*n^3)*a(n+3)+(-15024*n^2-22732*n+6864-2228*n^3)*a(n+4)+(-217*n^3-2604*n^2-10199*n-13020)*a(n+5)}
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| MAPLE
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spec:= [S, {C=Prod(B, B), S=Prod(C, C), B=Union(S, C, Z)}, unlabelled]:seq(combstruct[count](spec, size=n), n=0..20);
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| KEYWORD
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easy,nonn
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| AUTHOR
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encyclopedia@pommard.inria.fr, Jan 25 2000
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| STATUS
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approved
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