login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A321680
as a simple table
n
a(n)
0
1
1
1
2
3
3
4
4
9
5
14
6
39
7
80
8
216
9
538
10
1460
[1,1,3,4,9,14,39,80,216,538,1460]