login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A323998
as a simple table
n
a(n)
2
1
3
3
4
144
5
945
6
51840
7
2851200
8
174356582400
9
112086374400
[1,3,144,945,51840,2851200,174356582400, 112086374400]
