login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A347919
as a simple table
n
a(n)
1
0
2
6
3
20
4
202
5
3147
6
70780
7
1916876
8
64729352
[0,6,20,202,3147,70780,1916876,64729352]