login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A180841
as a simple table
n
a(n)
1
1
2
1
3
19
4
596
5
37423
6
3746117
7
545626043
8
109162526742
9
28754907355070
[1,1,19,596,37423,3746117,545626043,109162526742, 28754907355070]