A124528 a(n) = Sum_{k=0..n} 2^k*A124526(n,k) for n>=0.

1, 1, 3, 8, 26, 94, 377, 1639, 7623, 38034, 199338, 1111816, 6442481, 39478219, 249507483, 1659172454, 11321526022, 80944313164, 591617080305, 4514822914133, 35120998653271, 284407875530728, 2342407874087454

Offset

0,3

Links

Table of n, a(n) for n=0..22.

Prog

(PARI) {a(n)=sum(k=0, n\2, 2^k*(n\2)!*((n+1)\2)!*polcoeff(polcoeff(exp((1+y)*(exp(x+x*O(x^n))-1)), n\2), k) *polcoeff(polcoeff(exp((1+y)*(exp(x+x*O(x^n))-1)), (n+1)\2), k))}

Crossrefs

Cf. A124526, A124527, A124529.

Sequence in context: A074506 A215087 A148822 * A320344 A006870 A348620

Adjacent sequences: A124525 A124526 A124527 * A124529 A124530 A124531

Keyword

nonn

Author

Paul D. Hanna, Nov 08 2006

Status

approved