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A115046
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G.f.: (1+x^2)^2*(x^4-6*x^3+1)/(x^2-1)^4.
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1
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1, 0, 6, -6, 20, -36, 50, -114, 104, -264, 190, -510, 316, -876, 490, -1386, 720, -2064, 1014, -2934, 1380, -4020, 1826, -5346, 2360, -6936, 2990, -8814, 3724, -11004, 4570, -13530, 5536, -16416, 6630, -19686, 7860, -23364, 9234, -27474, 10760, -32040, 12446, -37086, 14300, -42636, 16330
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OFFSET
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0,3
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COMMENTS
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This sequence arose from an arithmetic error when computing A136264.
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LINKS
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Table of n, a(n) for n=0..46.
Index entries for linear recurrences with constant coefficients, signature (0,4,0,-6,0,4,0,-1).
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FORMULA
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a(n)= -n/12+3/4-n^3/6+3n^2/4+(-1)^n*(-3n^2/4+29n/12-3/4+n^3/3), n>0. [From R. J. Mathar, Mar 15 2009]
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CROSSREFS
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Sequence in context: A246037 A045896 A309122 * A004983 A298936 A034695
Adjacent sequences: A115043 A115044 A115045 * A115047 A115048 A115049
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KEYWORD
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sign,easy
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AUTHOR
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Roger L. Bagula, Feb 28 2006
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EXTENSIONS
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Edited by N. J. A. Sloane, Dec 21 2006 and Apr 19 2008
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STATUS
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approved
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