login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A246909
as a simple table
n
a(n)
1
-1
2
2
3
1
4
28
5
15456
6
831376
[-1,2,1,28,15456,831376]