login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A396048
as a simple table
n
a(n)
1
0
2
0
3
1
4
5
5
45
6
1270
7
107387
8
29903617
[0,0,1,5,45,1270,107387,29903617]
