id:A135019 - OEIS Search Results

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a(n)=-a(n-1)+2a(n-2)-a(n-3).

+0
1

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; listen)

	OFFSET	`0,3`
	FORMULA	`Sequence is identical to its signed second differences less first 3 terms.` `a(n)(-1)^(n+1) = A002478(n-1)+2A002478(n-2). G.f.: -x(-1+2x)/(1+x-2*x^2+x^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 17 2009]`
	CROSSREFS	`Sequence in context: A151524 A030270 A129757 this_sequence A141685 A017921 A161762` `Adjacent sequences: A135016 A135017 A135018 this_sequence A135020 A135021 A135022`
	KEYWORD	`sign`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Feb 10 2008`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 17 2009`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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