login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A253316
as a simple table
n
a(n)
0
1
1
2
2
72
3
4140
4
4111116
5
48183195384
[1,2,72,4140,4111116,48183195384]