login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A290719
as a simple table
n
a(n)
1
1
2
3
3
22
4
168
5
5251
6
194751
7
27478594
8
3852814320
9
2065546517563
[1,3,22,168,5251,194751,27478594,3852814320, 2065546517563]