OFFSET
0,4
LINKS
Winston de Greef, Table of n, a(n) for n = 0..414
Eric Weisstein's World of Mathematics, Lambert W-Function.
FORMULA
a(n) = n! * [x^n] exp(x - n*x^2/2).
E.g.f.: exp( sqrt( LambertW(x^2) ) ) / (1 + LambertW(x^2)).
PROG
(PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(sqrt(lambertw(x^2)))/(1+lambertw(x^2))))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Apr 13 2023
STATUS
approved