id:A049130 - OEIS Search Results

Search: id:A049130

Displaying 1-1 of 1 results found.

page 1

Revert transform of ((x - 1)(x + 1))/(-1 - x + x^3).

+0
1

1, 1, 2, 4, 10, 26, 73, 211, 630, 1918, 5944, 18668, 59311, 190243, 615269, 2004025, 6568174, 21645438, 71681152, 238416580, 796107464, 2667768904, 8968626418, 30240087086, 102238147891, 346514952331, 1177137322768, 4007326361986 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Binomial transform of aerated version of A001764. - Paul Barry (pbarry(AT)wit.ie), Nov 05 2006`
	LINKS	`Index entries for reversions of series`
	FORMULA	`a(n)=sum{k=0..floor(n/2), C(n,2k)*C(3k,k)/(2k+1)}; a(n)=sum{k=0..n, C(3k/2,k/2)(1+(-1)^k)/(2(k+1))}; - Paul Barry (pbarry(AT)wit.ie), Nov 05 2006`
	CROSSREFS	`Sequence in context: A102407 A148097 A148098 this_sequence A101488 A089429 A049143` `Adjacent sequences: A049127 A049128 A049129 this_sequence A049131 A049132 A049133`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

page 1

Search completed in 0.002 seconds

Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

AT&T Labs Research