login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A172478
as a simple table
n
a(n)
1
1
2
4
3
72
4
13872
5
11762160
6
234312972480
7
41182101508222080
[1,4,72,13872,11762160,234312972480, 41182101508222080]