OFFSET
0,2
COMMENTS
Logarithmic derivative yields A206178.
EXAMPLE
G.f.: A(x) = 1 + 3*x + 15*x^2 + 93*x^3 + 657*x^4 + 5067*x^5 + 41579*x^6 +...
where
log(A(x)) = 3*x + 21*x^2/2 + 171*x^3/3 + 1521*x^4/4 + 14283*x^5/5 + 138909*x^6/6 +...+ A206178(n)*x^n/n +...
PROG
(PARI) {a(n)=polcoeff(exp(sum(m=1, n, x^m/m*sum(k=0, m, binomial(m, k)^3*2^k))+x*O(x^n)), n)}
CROSSREFS
KEYWORD
nonn,changed
AUTHOR
Paul D. Hanna, Feb 04 2012
STATUS
approved