login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A154644
as a simple table
n
a(n)
0
1
1
3
2
20
3
174
4
1170
5
8454
[1,3,20,174,1170,8454]