OFFSET
0,3
COMMENTS
EXAMPLE
O.g.f.: A(x) = 1 + x + 4*x^2 + 8*x^3 + 21*x^4 + 39*x^5 + 93*x^6 +...
log(A(x)) = x + 7*x^2/2 + 13*x^3/3 + 35*x^4/4 + 31*x^5/5 + 97*x^6/6 +...
PROG
(PARI) {a(n)=polcoeff(exp(sum(m=1, n, (sigma(m)^2+sigma(m, 2))/2*x^m/m)+x*O(x^n)), n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Oct 10 2010
STATUS
approved