A117266 Row sums of triangle A117265.

1, 2, 6, 37, 497, 14033, 813857, 95996993, 22913626241, 11034472530177, 10699863490757121, 20863301244829828097, 81721932792141693585409, 642577422892784159654154241, 10136733849914528413869372612609

Offset

0,2

Links

Table of n, a(n) for n=0..14.

Formula

a(n) = Sum_{k=0..n} (2*(n-k))!/((n-k)!*(n-k)!)*2^((n-k)*(n+k-3)/2).

Prog

(PARI) a(n)=sum(k=0, n, (2*(n-k))!/((n-k)!*(n-k)!)*2^((n-k)*(n+k-3)/2))

Crossrefs

Cf. A117265.

Sequence in context: A014056 A241300 A113375 * A259437 A202737 A186648

Adjacent sequences: A117263 A117264 A117265 * A117267 A117268 A117269

Keyword

nonn

Author

Paul D. Hanna, Mar 14 2006

Status

approved