login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A222809
as a simple table
n
a(n)
1
0
2
9
3
21
4
122
5
228
6
1167
7
2123
8
11270
9
20440
10
110971
11
201475
12
1103592
13
2005388
[0,9,21,122,228,1167,2123,11270,20440,110971, 201475,1103592,2005388]