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A077905
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Expansion of 1/(1 - x^2 - x^3 + x^4).
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0
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1, 0, 1, 1, 0, 2, 0, 1, 2, -1, 3, 0, 0, 4, -3, 4, 1, -3, 8, -6, 4, 5, -10, 15, -9, 0, 16, -24, 25, -8, -15, 41, -48, 34, 8, -55, 90, -81, 27, 64, -144, 172, -107, -36, 209, -315, 280, -70, -244, 525, -594, 351, 175, -768, 1120, -944, 177, 944, -1887, 2065, -1120, -766, 2832, -3951, 3186, -353, -3597, 6784, -7136
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OFFSET
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0,6
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LINKS
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Table of n, a(n) for n=0..68.
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FORMULA
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a(n)=sum(k=1..n/2, sum(j=0..k, binomial(j,n-4*k+2*j)*(-1)^(k-j)*binomial(k,j))), n>0, a(0)=1. [From Vladimir Kruchinin, Oct 21 2011]
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EXAMPLE
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a(n)=sum(k=1..n/2, sum(j=0..k, binomial(j,n-4*k+2*j)*(-1)^(k-j)*binomial(k,j))), n>0, a(0)=1. [From Vladimir Kruchinin, Oct 21 2011]
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MATHEMATICA
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CoefficientList[ Series[1/((1 - x) (1 + x - x^3)), {x, 0, 68}], x] (* Robert G. Wilson v, 29 Oct 2011 *)
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CROSSREFS
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Sequence in context: A029389 A025835 A029277 * A131331 A020513 A029276
Adjacent sequences: A077902 A077903 A077904 * A077906 A077907 A077908
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KEYWORD
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sign
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AUTHOR
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N. J. A. Sloane, Nov 17 2002
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STATUS
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approved
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