login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A306505
as a simple table
n
a(n)
0
1
1
2
2
4
3
9
4
29
5
209
6
16352
7
490013147
8
1392195548889993357
9
789204635842035040527740846300252679
[1,2,4,9,29,209,16352,490013147, 1392195548889993357, 789204635842035040527740846300252679]