id:A106269 - OEIS Search Results

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Expansion of 1/((1-x^2)(2-c(x))), c(x) the g.f. of A000108.

+0
2

1, 1, 4, 11, 39, 137, 501, 1853, 6936, 26163, 99314, 378879, 1451392, 5579179, 21509692, 83137939, 322049887, 1249941049, 4859617537, 18922572949, 73782881947, 288051510169, 1125832363807, 4404766873969, 17249634205357 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Row sums of number triangle A106268.`
	FORMULA	`a(n)=(-1)^n*sum{k=0..floor(n/2), binomial(2k-n, n-2k)}.`
	CROSSREFS	`Sequence in context: A149257 A050987 A137191 this_sequence A126758 A149258 A149259` `Adjacent sequences: A106266 A106267 A106268 this_sequence A106270 A106271 A106272`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 28 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research