OFFSET
0,3
EXAMPLE
E.g.f.: A(x) = 1 + x + 7*x^2/2!^2 + 100*x^3/3!^2 + 2438*x^4/4!^2 + 90246*x^5/5!^2 +...
such that
log(A(x)) = x + x^2*(1+1/4) + x^3*(1+1/4+1/9) + x^4*(1+1/4+1/9+1/16) + x^5*(1+1/4+1/9+1/16+1/25) + x^6*(1+1/4+1/9+1/16+1/25+1/36) +...
PROG
(PARI) {a(n)=n!^2*polcoeff(exp(sum(m=1, n+1, x^m*sum(k=1, m, 1/k^2)+x*O(x^n))), n)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, May 03 2012
STATUS
approved