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A135019
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a(n) = -a(n-1) + 2a(n-2) - a(n-3), with a(0) = 0, a(1) = 1, a(2) = -3.
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1
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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
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OFFSET
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0,3
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COMMENTS
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Sequence is identical to its signed second differences less first 3 terms.-
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LINKS
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FORMULA
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G.f.: x*(1 - 2*x)/(1 + x - 2*x^2 + x^3). (End)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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