OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..497
FORMULA
a(n) ~ 3^(n - 1/2) * n^(2*n/3) * exp(-392/6561 - 2*n/3 + 49*n^(1/3)/243 + 4*n^(2/3)/9). - Vaclav Kotesovec, Oct 15 2017
MATHEMATICA
CoefficientList[Series[E^(x + 4*x^2 + 9*x^3), {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Oct 15 2017 *)
PROG
(PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp(x+4*x^2+9*x^3)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 15 2017
STATUS
approved