login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A053912
as a simple table
n
a(n)
1
1
2
9
3
109
4
280859
5
105769141
6
279067891
[1,9,109,280859,105769141,279067891]