OFFSET
0,10
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..300
FORMULA
E.g.f.: 1/(1+LambertW(-x)^9)^(1/9). - Vaclav Kotesovec, Sep 01 2014
a(n) ~ n^(n-4/9) * 2^(4/9) * sqrt(Pi) / (3^(2/9) * Gamma(1/18)) * (1 - 52 * sqrt(2/n) * Gamma(1/18) / (243 * Gamma(5/9))). - Vaclav Kotesovec, Sep 01 2014
MAPLE
with(combinat):
b:= proc(n, i) option remember; `if`(n=0, 1,
`if`(i>n, 0, add(b(n-i*j, i+9)*(i-1)!^j*
multinomial(n, n-i*j, i$j)/j!, j=0..n/i)))
end:
a:= a->add(b(j, 9)*n^(n-j)*binomial(n-1, j-1), j=0..n):
seq(a(n), n=0..25);
MATHEMATICA
CoefficientList[Series[1/(1+LambertW[-x]^9)^(1/9), {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Sep 01 2014 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 31 2014
STATUS
approved