OFFSET
0,2
COMMENTS
Compare to an e.g.f. of A248656: Sum_{n>=0} exp(n*(n+1)/2*x)/(1 + exp(n*x))^(n+1).
EXAMPLE
E.g.f.: A(x) = 1 - 154*x^2/2! + 22885622*x^4/4! - 67465813019194*x^6/6! +-...
where
A(x) = 1/2 + exp(x)/(1+exp(x))^2 + exp(6*x)/(1+exp(4*x))^3 + exp(18*x)/(1+exp(9*x))^4 + exp(40*x)/(1+exp(16*x))^5 + exp(75*x)/(1+exp(25*x))^6 +...
PROG
(PARI) \p200 \\ set precision
{A=Vec(serlaplace(sum(n=0, 800, 1.*exp(n^2*(n+1)/2*x +O(x^31))/(1 + exp(n^2*x +O(x^31)))^(n+1)) ))}
for(n=1, #A\2, print1(round(A[2*n-1]), ", "))
CROSSREFS
KEYWORD
sign
AUTHOR
Paul D. Hanna, Oct 26 2014
STATUS
approved