OFFSET
3,2
REFERENCES
L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 262 (#14).
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 3..400
FORMULA
G.f.: (1-1/Sum (k! x^k ))^3.
a(n) ~ 3*sqrt(2*Pi) * n^(n - 3/2) / exp(n). - Vaclav Kotesovec, Jun 25 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Feb 01 2001
EXTENSIONS
More terms from Vladeta Jovovic, Mar 04 2001
STATUS
approved