A135261 - OEIS

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A135261

a(n)=3*A131090(n)-A131090(n+1).

-1, 3, -1, 2, -1, 5, 6, 17, 27, 58, 111, 229, 454, 913, 1819, 3642, 7279, 14565, 29126, 58257, 116507, 233018, 466031, 932069, 1864134, 3728273, 7456539, 14913082, 29826159, 59652325, 119304646, 238609297, 477218587, 954437178, 1908874351, 3817748709, 7635497414 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`A131090(n)-a(n)=A131556(n).` `O.g.f.: (1-x)^2*(1-3x)/((2x-1)(1+x)(x^2-x+1)) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 22 2008`
	CROSSREFS	`Sequence in context: A046645 A016470 A059807 * A102774 A131918 A010123` `Adjacent sequences: A135258 A135259 A135260 * A135262 A135263 A135264`
	KEYWORD	`sign`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Dec 01 2007`
	EXTENSIONS	`Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 22 2008`

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Last modified February 14 05:35 EST 2012. Contains 205570 sequences.