id:A084056 - OEIS Search Results

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a(n)=-2a(n-1)-a(n-1), a(0)=0, a(1)=1.

+0
4

0, 1, -3, 4, -6, 7, -9, 10, -12, 13, -15, 16, -18, 19, -21, 22, -24, 25, -27, 28, -30, 31, -33, 34, -36, 37, -39, 40, -42, 43, -45, 46, -48, 49, -51, 52, -54, 55, -57, 58, -60, 61, -63, 64, -66, 67, -69, 70, -72, 73, -75, 76, -78, 79, -81, 82, -84, 85, -87, 88, -90 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`abs(a(n))=A032766(n).`
	FORMULA	`a(n)=(1-6n)(-1)^n/4-1/4; G.f.: (x-2x^2)/((1+x)(1-x^2)).`
	CROSSREFS	`Sequence in context: A078607 A026322 A049624 this_sequence A032766 A064717 A109231` `Adjacent sequences: A084053 A084054 A084055 this_sequence A084057 A084058 A084059`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 09 2003`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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