id:A100136 - OEIS Search Results

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Sum C(n-3k,3k)3^k, k=0..floor(n/6).

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1, 1, 1, 1, 1, 1, 4, 13, 31, 61, 106, 169, 262, 424, 748, 1417, 2749, 5251, 9709, 17395, 30553, 53434, 94285, 168859, 306283, 558742, 1017895, 1844044, 3320044, 5952472, 10660177, 19119385, 34383781, 61985497, 111884665, 201938701, 364128136 (list; graph; listen)

	OFFSET	`0,7`
	FORMULA	`G.f.: (1-x)^2/((1-x)^3-3x^6); a(n)=3a(n-1)-3a(n-2)+a(n-3)+3a(n-6).`
	CROSSREFS	`Cf. A100134.` `Adjacent sequences: A100133 A100134 A100135 this_sequence A100137 A100138 A100139` `Sequence in context: A075880 A042487 A106302 this_sequence A097120 A098536 A011937`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 06 2004`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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