login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A095853
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
6
6
18
7
70
8
446
9
3924
[0,0,0,0,6,18,70,446,3924]