OFFSET
0,3
COMMENTS
See A266539 for more details.
LINKS
Robert Israel, Table of n, a(n) for n = 0..435
FORMULA
E.g.f. y(x) = log(A(x)) and y'(x) = B(x) where A(x), B(x) are as in A266539.
a(n) ~ c^n * (n-1)!, where c = 1/Integral_{x=0..infinity} 1/(x + exp(x)) dx = 1.2400861064984976662394901721056528110217273471501174317019052800276... - Vaclav Kotesovec, Aug 21 2017
EXAMPLE
E.g.f. = x + 2*x^2/2! + 5*x^3/3! + 17*x^4/4! + ...
MAPLE
S:= dsolve({diff(y(x), x) = y(x) + exp(y(x)), y(0)=0}, y(x), series, order=31):
seq(coeff(rhs(S), x, j)*j!, j=0..30); # Robert Israel, Aug 09 2017
MATHEMATICA
a[ n_] := If[ n < 0, 0, n! SeriesCoefficient[ InverseSeries[ Series[Integrate[ 1 / (x + Exp[x]), x], {x, 0, n}]], {x, 0, n}]];
PROG
(PARI) {a(n) = if( n<0, 0, my(A = O(x)); for(k=1, n, A = intformal(A + exp(A))); n! * polcoeff(A, n))};
(PARI) {a(n) = if( n<0, 0, n! * polcoeff( serreverse( intformal( 1 / (exp(x + x * O(x^n)) + x))), n))};
CROSSREFS
KEYWORD
nonn
AUTHOR
Michael Somos, Aug 09 2017
STATUS
approved