id:A110521 - OEIS Search Results

Search: id:A110521

Displaying 1-1 of 1 results found.

page 1

Expansion of 1/(1-(x+x^2)c(3x)), c(x) the g.f. of A000108.

+0
2

1, 1, 5, 30, 224, 1871, 16771, 157668, 1533970, 15314626, 156008660, 1615147014, 16944659846, 179746651907, 1924700759635, 20776060271760, 225838715259574, 2469974866825150, 27160344857205806, 300101157823582668 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Diagonal sums of A110519.`
	FORMULA	`a(0)=1, a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, j*C(2n-2k-j-1, n-k-j)C(j, k)3^(n-k-j)/(n-k)}}, n>0`
	CROSSREFS	`Sequence in context: A058247 A137965 A129695 this_sequence A072213 A052172 A058783` `Adjacent sequences: A110518 A110519 A110520 this_sequence A110522 A110523 A110524`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 24 2005`

page 1

Search completed in 0.002 seconds

Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research