login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A305571
as a simple table
n
a(n)
1
1
2
0
3
0
4
48
5
480
6
0
7
1290240
8
25484820480
9
34482663290880
[1,0,0,48,480,0,1290240,25484820480, 34482663290880]