A122891 - OEIS

A122891

Column sums of triangle A122890.

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

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OFFSET

0,3

LINKS

PROG

(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), ", "))}

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved