login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A004145
as a simple table
n
a(n)
2
0
3
12
4
1360
5
350000
6
255036992
7
571462430224
[0,12,1360,350000,255036992,571462430224]