A122891 Column sums of triangle A122890.

1, 1, 3, 28, 1625, 3247268, 10649997137454, 113423713055030979289411081, 12864938683278671740537137672878980378983810317967737

Offset: 0

Author

Paul D. Hanna, Sep 18 2006

Keywords

• nonn

Crossrefs

Cf. A122890, A122888; A007018.

Programs

PARI

{A122890(n, k)=local(F=x+x^2, G=x+x*O(x^k)); if(n<0, 0, for(i=1, n, G=subst(F, x, G)); polcoeff(G, k, x))}
/* Takes first 2^m terms in column m of A122890 to compute a(m): */
{for(m=0,8,print1(polcoeff(sum(N=1,2^m,sum(n=0,2^m,A122890(n,N)*x^n)*(1-x)^N+O(x^12)),m),","))}