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#14 by Susanna Cuyler at Fri Mar 02 14:13:48 EST 2018
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#13 by Colin Barker at Fri Mar 02 12:36:29 EST 2018
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#12 by Colin Barker at Fri Mar 02 12:35:57 EST 2018
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| FORMULA
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Empirical: a(n) = 2*a(n-1) -) - a(n-2) +) + 2*a(n-3) -) - 4*a(n-4) +) + 2*a(n-5) -) - a(n-6) +) + 2*a(n-7) -) - a(n-8).
Empirical g.f.: x*(4 + x + 8*x^2 - 2*x^3 + 4*x^4 + 2*x^6 - x^7) / ((1 - x)^4*(1 + x + x^2)^2). - Colin Barker, Mar 02 2018
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| EXAMPLE
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Some solutions for n=6:
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| CROSSREFS
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Cf. A200154.
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| STATUS
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approved
editing
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#11 by Michel Marcus at Tue Apr 08 00:17:23 EDT 2014
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#10 by Michel Marcus at Tue Apr 08 00:17:19 EDT 2014
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| AUTHOR
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_R. H. Hardin_ _, Nov 13 2011
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| STATUS
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proposed
editing
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#9 by Jon E. Schoenfield at Tue Apr 08 00:14:13 EDT 2014
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#8 by Jon E. Schoenfield at Tue Apr 08 00:14:10 EDT 2014
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| NAME
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Number of 0..n arrays x(0..3) of 4 elements with zero 3rd differencedifferences.
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| STATUS
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proposed
editing
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#7 by Jon E. Schoenfield at Tue Apr 08 00:13:12 EDT 2014
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#6 by Jon E. Schoenfield at Tue Apr 08 00:13:09 EDT 2014
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| NAME
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Number of 0..n arrays x(0..3) of 4 elements with zero 3th3rd difference.
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| COMMENTS
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Row 4 of A200154.
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| FORMULA
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Empirical: a(n) = 2*a(n-1) -a(n-2) +2*a(n-3) -4*a(n-4) +2*a(n-5) -a(n-6) +2*a(n-7) -a(n-8)).
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| STATUS
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approved
editing
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#5 by Russ Cox at Sat Mar 31 12:36:38 EDT 2012
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| AUTHOR
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_R. H. Hardin (rhhardin(AT)att.net) _ Nov 13 2011
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Discussion
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| Sat Mar 31
| 12:36
| OEIS Server: https://oeis.org/edit/global/875
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