login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A288850
as a simple table
n
a(n)
0
1
1
3
2
6
3
16
4
58
5
321
6
2585
7
30198
[1,3,6,16,58,321,2585,30198]