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#19 by Vaclav Kotesovec at Thu Jul 09 09:40:44 EDT 2020
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#18 by Michel Marcus at Thu Jul 09 08:26:17 EDT 2020
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#17 by Michel Marcus at Thu Jul 09 08:26:15 EDT 2020
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| PROG
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(PARI) f(n) = if( issquare( 24*n + 1, &n), kronecker( 12, n)); \\ A010815
a(n) = sum(k=0, n, stirling(n, k, 2) * k! * f(k)); \\ Michel Marcus, Jul 09 2020
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| STATUS
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approved
editing
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#16 by Peter Luschny at Thu Jul 09 07:23:05 EDT 2020
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#15 by Vaclav Kotesovec at Thu Jul 09 03:25:53 EDT 2020
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#14 by Vaclav Kotesovec at Thu Jul 09 03:25:43 EDT 2020
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#13 by Vaclav Kotesovec at Thu Jul 09 03:25:17 EDT 2020
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| MATHEMATICA
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A010815[k_] := (m = (1 + Sqrt[1 + 24*k])/6; If[IntegerQ[m], (-1)^m, 0] + If[IntegerQ[m - 1/3], (-1)^(m - 1/3), 0]); Table[Sum[StirlingS2[n, k] * k! * A010815[k], {k, 0, n}], {n, 0, 20}] (* Vaclav Kotesovec, Jul 09 2020 *)
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proposed
editing
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#12 by Seiichi Manyama at Thu Jul 09 02:51:51 EDT 2020
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#11 by Seiichi Manyama at Thu Jul 09 02:51:44 EDT 2020
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#10 by Seiichi Manyama at Wed Jul 08 19:22:31 EDT 2020
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