id:A080424 - OEIS Search Results

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a(n)=3a(n-1)+18a(n-2), a(0)=0, a(1)=1.

+0
5

0, 1, 3, 27, 135, 891, 5103, 31347, 185895, 1121931, 6711903, 40330467, 241805655, 1451365371, 8706597903, 52244370387, 313451873415, 1880754287211, 11284396583103, 67706766919107, 406239439253175, 2437440122303451 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`G.f.: x/((1+3x)(1-6x)); a(n)=(6^n-(-3)^n)/9.`
	CROSSREFS	`Cf. A079773, A051958, A015441.` `Sequence in context: A161807 A063263 A034200 this_sequence A001796 A127509 A108142` `Adjacent sequences: A080421 A080422 A080423 this_sequence A080425 A080426 A080427`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 24 2003`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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