login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A064120
as a simple table
n
a(n)
0
1
1
6
2
180
3
873600
4
772107033600
[1,6,180,873600,772107033600]