login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A331158
as a simple table
n
a(n)
0
1
1
4
2
17
3
86
4
532
5
4068
6
38933
7
474822
8
7558620
[1,4,17,86,532,4068,38933,474822,7558620]