login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A046873
as a simple table
n
a(n)
0
1
1
1
2
2
3
48
4
1680384
5
14807804035657359360
6
141377911697227887117195970316200795630205476957716480
[1,1,2,48,1680384,14807804035657359360, 14137791169722788711719597031620079563020547695771\ 6480]