OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..385
FORMULA
a(n) ~ n^(n-1) / 2.
MATHEMATICA
CoefficientList[Series[-1/(1+LambertW[-x]^2), {x, 0, 20}], x] * Range[0, 20]!
PROG
(PARI) x='x+O('x^50); Vec(serlaplace(-1/(1 + lambertw(-x)^2))) \\ G. C. Greubel, Nov 08 2017
CROSSREFS
KEYWORD
sign
AUTHOR
Vaclav Kotesovec, Oct 17 2016
STATUS
approved