login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A221118
as a simple table
n
a(n)
1
0
2
0
3
1769
4
1424745
5
709142453
6
326416281638
7
143089274586815
8
62066225367961944
[0,0,1769,1424745,709142453,326416281638, 143089274586815,62066225367961944]