id:A133594 - OEIS Search Results

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a(n)=3*a(n-1)+12*a(n-2) for n>=3, a(0)=1, a(1)=3, a(2)=18 .

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1, 3, 18, 90, 486, 2538, 13446, 70794, 373734, 1970730, 10396998, 54839754, 289283238, 1525926762, 8049179142, 42458658570, 223966125414, 1181402279082, 6231800342214, 32872228375626, 173398289233446, 914661608207850 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: (1-3x^2)/(1-3x-12x^2) . a(n) = Sum_{k, 0<=k<=n}A122950(n,k)3^k .`
	CROSSREFS	`Adjacent sequences: A133591 A133592 A133593 this_sequence A133595 A133596 A133597` `Sequence in context: A124811 A006568 A088336 this_sequence A092691 A064671 A058409`
	KEYWORD	`easy,nonn`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 31 2007`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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