login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A240503
as a simple table
n
a(n)
1
4
2
8
3
72
4
396
5
4428
6
63152
[4,8,72,396,4428,63152]