OFFSET
0,2
EXAMPLE
G.f.: A(x) = 1 + 14*x + 161*x^2 + 1678*x^3 + 15524*x^4 + 134844*x^5 +...
log(A(x)) = 14*x + 126*x^2/2 + 1016*x^3/3 + 4094*x^4/4 + 24564*x^5/5 + 131064*x^6/6 + 524272*x^7/7 +...+ 2*sigma(n*4^n)*x^n/n +...
PROG
(PARI) {a(n)=polcoeff(exp(sum(m=1, n, 2*sigma(m*4^m)*x^m/m)+x*O(x^n)), n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 15 2011
STATUS
approved