OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..200
FORMULA
E.g.f.: exp(Sum_{j=0..3} (x*exp(x))^(2^j)/(2^j)).
MAPLE
egf:= exp(add((x*exp(x))^(2^j)/(2^j), j=0..3)):
a:= n-> n!*coeff(series(egf, x, n+1), x, n):
seq(a(n), n=0..25);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 24 2014
STATUS
approved