A209197 Column 1 of triangle A209196.

1, 4, 32, 487, 11113, 335745, 12607257, 565877928, 29553415078, 1760584360722, 117828762999498, 8752769915058447, 714626485356930711, 63609663369881873031, 6130647517448380412727, 636052622643842997577302, 70679525819378610579659532, 8375262433274665594692923984

Offset: 1

Author

Paul D. Hanna, Mar 05 2012

Keywords

• nonn

Comments

G.f. of A209196 is exp( Sum_{n>=1} x^n/n * Sum_{k=0..n} binomial(n^2, n*k) * y^k ).

Programs

PARI

{a(n)=polcoeff(polcoeff(exp(sum(m=1,n,x^m/m*sum(j=0,m,binomial(m^2,m*j)*y^j))+x*O(x^n)),n,x),1,y)}
for(n=1,20,print1(a(n),", "))