A059440 A diagonal of A059438.
1, 3, 12, 58, 327, 2109, 15366, 125316, 1135329, 11348623, 124359336, 1484796894, 19204214363, 267627706257, 3998828758938, 63777662250440, 1081442839245381, 19426122224995107, 368492543629967292
Offset: 3
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
Extensions
More terms from Vladeta Jovovic, Mar 04 2001