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A135019
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a(n)=-a(n-1)+2a(n-2)-a(n-3).
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0
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0, 1, -3, 5, -12, 25, -54, 116, -249, 535, -1149, 2468, -5301, 11386, -24456, 52529, -112827, 242341, -520524, 1118033, -2401422, 5158012, -11078889, 23796335, -51112125, 109783684, -235804269, 506483762, -1087875984, 2336647777
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| Sequence is identical to its signed second differences less first 3 terms.
a(n)*(-1)^(n+1) = A002478(n-1)+2*A002478(n-2). G.f.: -x*(-1+2*x)/(1+x-2*x^2+x^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 17 2009]
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CROSSREFS
| Sequence in context: A151524 A030270 A129757 * A141685 A017921 A161762
Adjacent sequences: A135016 A135017 A135018 * A135020 A135021 A135022
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KEYWORD
| sign
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Feb 10 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 17 2009
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