id:A133444 - OEIS Search Results

Search: id:A133444

Displaying 1-1 of 1 results found.

page 1

a(n)=sum{k=0..n, C(n,floor(k/2))*(-1)^k*4^(n-k)}.

+0
1

1, 3, 14, 57, 246, 1038, 4424, 18777, 79846, 339258, 1442004, 6128202, 26045436, 110691948, 470442924, 1999378137, 8497365126, 36113785698 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Hankel transform is 5^n . Second binomial transform is A076036 .`
	FORMULA	`a(n)=Sum{k, 0<=k<=n} A053121(n,k)A015521(k+1) = (-1)^nA127363(n) . G.f.: (1/sqrt(1-4x^2))(1-xc(x^2))/(1-4x*c(x^2)), where c(x) is the g.f. of Catalan numbers A000108 .`
	CROSSREFS	`Sequence in context: A135926 A015523 A127363 this_sequence A126875 A110526 A038679` `Adjacent sequences: A133441 A133442 A133443 this_sequence A133445 A133446 A133447`
	KEYWORD	`nonn`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 26 2007`

page 1

Search completed in 0.002 seconds

Last modified December 4 21:35 EST 2008. Contains 151309 sequences.

AT&T Labs Research