login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A171655
as a simple table
n
a(n)
1
0
2
1
3
2
4
3
5
7
6
20
7
22
8
65
9
122
10
355
11
561
12
2216
13
5638
14
7271
[0,1,2,3,7,20,22,65,122,355,561,2216,5638,7271]