OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..75
FORMULA
a(n) = [x^n] (n!)^9 * (Sum_{j=0..n} x^j/(j!)^9)^n.
MAPLE
b:= proc(n, i) option remember; `if`(n=0 or i=1, 1,
add(b(n-j, i-1)*binomial(n, j)^9, j=0..n))
end:
a:= n-> b(n$2):
seq(a(n), n=0..15);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 19 2014
STATUS
approved