login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A018926
as a simple table
n
a(n)
0
1
1
2
2
8
3
154
4
89512
5
71319425714
[1,2,8,154,89512,71319425714]