A109245 Diagonal sums of number triangle A109244.

1, 1, 5, 15, 54, 193, 708, 2627, 9846, 37178, 141223, 539047, 2065813, 7943706, 30634329, 118433821, 458867295, 1781267606, 6926405025, 26973935420, 105189301334, 410707352869, 1605379739149, 6281519778025, 24601184635436

Offset

0,3

Links

Table of n, a(n) for n=0..24.

Formula

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

Crossrefs

Sequence in context: A149583 A149584 A147324 * A243076 A002221 A007714

Adjacent sequences: A109242 A109243 A109244 * A109246 A109247 A109248

Keyword

easy,nonn

Author

Paul Barry, Jun 23 2005

Status

approved