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A181933
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a(n) = Sum_{k=0..n} binomial(n+k,k)*sin(Pi*(n+k)/2).
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0
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0, 1, -3, 9, -30, 106, -385, 1421, -5304, 19966, -75658, 288222, -1102790, 4234868, -16312773, 63003869, -243896960, 946066678, -3676303578, 14308370014, -55768166380, 217640082188, -850345208538, 3325907590274, -13020993588680
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..24.
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MATHEMATICA
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f[n_] := Sum[ Binomial[n + k, k] Sin[Pi (n + k)/2], {k, 0, n}]; Array[f, 25, 0]
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CROSSREFS
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Cf. A026641, A176332.
Sequence in context: A148956 A003409 A029651 * A148957 A148958 A024332
Adjacent sequences: A181930 A181931 A181932 * A181934 A181935 A181936
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KEYWORD
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sign
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AUTHOR
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Robert G. Wilson v, Apr 02 2012
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STATUS
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approved
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