id:A122112 - OEIS Search Results

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a(0)=1, a(1)=-2, a(n)=4*a(n-2)-a(n-1) for n>1.

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1, -2, 6, -14, 38, -94, 246, -622, 1606, -4094, 10518, -26894, 68966, -176542, 452406, -1158574, 2968198, -7602494, 19475286, -49885262, 127786406, -327327454, 838473078, -2147782894, 5501675206, -14092806782, 36099507606, -92470734734 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=(-1)^nA026597(n) . a(n)=Sum_[k, 0<=k<=n}(-2)^(n-k)A055830(n,k) . G.f.: (1-x)/(1+x-4*x^2)`
	CROSSREFS	`Sequence in context: A071636 A100067 A026597 this_sequence A000634 A006654 A127546` `Adjacent sequences: A122109 A122110 A122111 this_sequence A122113 A122114 A122115`
	KEYWORD	`sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 18 2006`
	EXTENSIONS	`Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 07 2006`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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