A165639 - OEIS

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A165639

a(n)=(7/4)*(1+3*(-7)^(n-1)).

1, 7, -35, 259, -1799, 12607, -88235, 617659, -4323599, 30265207, -211856435, 1482995059, -10380965399, 72666757807, -508667304635, 3560671132459, -24924697927199, 174472885490407, -1221310198432835, 8549171389029859 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n)=(-7)a(n-1)+14 with a(0)=1. a(0)=1, a(1)=7, a(n)=7a(n-2)-6a(n-1). G.f.: (1+13x)/(1+6x-7x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)6^(n-k).`
	CROSSREFS	`Sequence in context: A184460 A096686 A165505 * A073109 A078235 A197555` `Adjacent sequences: A165636 A165637 A165638 * A165640 A165641 A165642`
	KEYWORD	`sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 23 2009`

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Last modified February 16 19:23 EST 2012. Contains 205945 sequences.