id:A099216 - OEIS Search Results

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a(n)=4a(n-1)-4a(n-2)+2a(n-3).

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1, 2, 4, 10, 28, 80, 228, 648, 1840, 5224, 14832, 42112, 119568, 339488, 963904, 2736800, 7770560, 22062848, 62642752, 177860736, 504997632, 1433833088, 4071063296, 11558916096, 32819077376, 93182771712, 264572609536 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Binomial transform of tribonacci numbers A000213.`
	FORMULA	`G.f.: (1-2x)/((1-2x)^2-2x^3); a(n)=sum{k=0..floor(n/3), binomial(n-k, 2k)2^k*2^(n-3k)}.`
	CROSSREFS	`Cf. A099214, A099215, A055588.` `Sequence in context: A123411 A128933 A106362 this_sequence A034472 A094388 A068875` `Adjacent sequences: A099213 A099214 A099215 this_sequence A099217 A099218 A099219`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 06 2004`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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