id:A080926 - OEIS Search Results

Search: id:A080926

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Partial sums of A080925.

+0
5

0, 1, 6, 19, 60, 181, 546, 1639, 4920, 14761, 44286, 132859, 398580, 1195741, 3587226, 10761679, 32285040, 96855121, 290565366, 871696099, 2615088300, 7845264901, 23535794706, 70607384119, 211822152360, 635466457081 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = Sum{i=0..n, Sum{k=1..i, Binomial(i, 2k-2)2^(2k-2)}}` `G.f.: x(1+3x)/((1+x)(1-x)(1-3x)); E.g.f.: (3exp(3x)+exp(-x))/4-exp(x); a(n)=(3*3^n+(-1)^n)/4-1.`
	CROSSREFS	`Sequence in context: A027044 A057571 A125069 this_sequence A041673 A137195 A055916` `Adjacent sequences: A080923 A080924 A080925 this_sequence A080927 A080928 A080929`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 26 2003`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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