id:A110167 - OEIS Search Results

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Diagonal sums of Riordan array A110165.

+0
2

1, 3, 12, 51, 226, 1026, 4733, 22083, 103914, 492228, 2344035, 11211210, 53817063, 259135299, 1251074772, 6053946531, 29354128498, 142584834924, 693691007267, 3379680991356, 16486985580693, 80521218046569, 393674826425462 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: (1/sqrt(1-6x+5x^2)/(1-x(1-3x-sqrt(1-6x+5x^2))/(2x)); a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, C(n-k, j)C(2j, j+k)}}.`
	CROSSREFS	`Sequence in context: A151182 A151316 A151183 this_sequence A151317 A151184 A151185` `Adjacent sequences: A110164 A110165 A110166 this_sequence A110168 A110169 A110170`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 14 2005`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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