id:A165759 - OEIS Search Results

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

+0
2

1, -7, -63, -455, -3199, -22407, -156863, -1098055, -7686399, -53804807, -376633663, -2636435655, -18455049599, -129185347207, -6330082013255, -44310574092799, -310174018649607, -2171218130547263, -15198526913830855 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(0)= 1, a(n)= 7a(n-1)-14. a(0)= 1, a(1)= -7, a(n)= 8a(n-1)-7a(n-2) for n>1. G.f.: (1-15x)/(1-8x+7x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)(-8)^(n-k).`
	CROSSREFS	`Sequence in context: A055405 A100741 A043027 this_sequence A166153 A123009 A024088` `Adjacent sequences: A165756 A165757 A165758 this_sequence A165760 A165761 A165762`
	KEYWORD	`easy,sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 26 2009`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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