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A034270
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f(n,n+3) where f is given in A034261.
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1
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0, 1, 13, 99, 605, 3289, 16653, 80444, 375972, 1715130, 7681586, 33913385, 148018455, 640049865, 2746422525, 11708971560, 49647131160, 209523969630, 880668859590, 3688555690950, 15401089588794, 64128925255626, 266376231244178, 1104047701891624, 4566956385797400
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OFFSET
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0,3
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LINKS
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FORMULA
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MATHEMATICA
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Table[n*(n^2+4*n+1)*Binomial[2*n+3, n]/((n+4)*(n+5)), {n, 0, 20}] (* Vaclav Kotesovec, Oct 27 2012 *)
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PROG
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(Magma) [n*(n^2+4*n+1)*Binomial(2*n+3, n)/((n+4)*(n+5)): n in [0..25]]; // Vincenzo Librandi, May 04 2013
(PARI) a(n)=n*(n^2+4*n+1)*binomial(2*n+3, n)/((n+4)*(n+5)); \\ Joerg Arndt, May 04 2013
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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