OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 5*x^2 + 10*x^3 + 40*x^4 + 67*x^5 + 262*x^6 +...
log(A(x)) = x + 9*x^2/2 + 16*x^3/3 + 89*x^4/4 + 36*x^5/5 + 504*x^6/6 +...
PROG
(PARI) {a(n)=polcoeff(exp(sum(m=1, n, sumdiv(m, d, binomial(m, d)*sigma(d)*sigma(m/d))*x^m/m)+x*O(x^n)), n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 10 2010
STATUS
approved