A109245 - OEIS

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A109245

Diagonal sums of number triangle A109244.

1

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

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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