id:A122959 - OEIS Search Results

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a(0)=1, a(n)=(-1)^n*(2-2^(n-1)) for n>0.

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1, -1, 0, 2, -6, 14, -30, 62, -126, 254, -510, 1022, -2046, 4094, -8190, 16382, -32766, 65534, -131070, 262142, -524286, 1048574, -2097170, 4194302, -8388606, 16777214, -33554430, 67108862, -134217726, 268435454 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`a(0)=1, a(1)=-1, a(2)=0, a(n)=(-3)a(n-1)-2a(n-2) for n>2 . G.f. : (1+2x-x^2)/(1+3x+2*x^2).`
	CROSSREFS	`Apart from signs, same as A000918.` `Sequence in context: A000918 A095121 A122958 this_sequence A059076 A002524 A055292` `Adjacent sequences: A122956 A122957 A122958 this_sequence A122960 A122961 A122962`
	KEYWORD	`sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 26 2006`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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