login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A240122
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
1
6
2
7
12
8
40
9
154
10
760
11
3260
12
22730
[0,0,0,0,1,2,12,40,154,760,3260,22730]