A156591 - OEIS

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A156591

First differences of A154570.

2, -7, 6, -8, 4, -12, -4, -28, -36, -92, -164, -348, -676, -1372, -2724, -5468, -10916, -21852, -43684, -87388, -174756, -349532, -699044, -1398108, -2796196, -5592412, -11184804, -22369628, -44739236, -89478492, -178956964, -357913948, -715827876 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 0..1000`
	FORMULA	`a(n)+a(n+1) = -A000079(n-1), n>0.` `a(n+1) = 4(-1)^(n+1)- A154879(n).` `G.f.: (1-3x)(2-3x)/((1+x)(1-2x)). a(n) = -2^n/6+20*(-1)^n/3, n>0. - R. J. Mathar, Feb 25 2009`
	CROSSREFS	`Sequence in context: A103557 A189959 A158241 * A138283 A117968 A154200` `Adjacent sequences: A156588 A156589 A156590 * A156592 A156593 A156594`
	KEYWORD	`sign,easy`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Feb 10 2009`
	EXTENSIONS	`Edited by R. J. Mathar (mathar(AT)strw.leidenunvi.nl), Feb 25 2009`

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Last modified February 16 16:51 EST 2012. Contains 205938 sequences.