login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A113723
as a simple table
n
a(n)
1
1
2
1
3
3
4
15
5
135
6
3845
7
769605
8
3821696361
[1,1,3,15,135,3845,769605,3821696361]