login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A123471
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
33
6
144
7
822
8
6744
9
73147
10
1006995
[1,2,4,11,33,144,822,6744,73147,1006995]