login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A006293
as a simple table
n
a(n)
4
1
5
5
6
56
7
945
8
28569
9
1421360
[1,5,56,945,28569,1421360]