n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 6 |
4 | 0 |
5 | 540 |
6 | 0 |
7 | 156240 |
8 | 0 |
9 | 96480720 |
10 | 0 |
11 | 104661849600 |
12 | 0 |
13 | 177947471782080 |
14 | 0 |
15 | 439942718370355200 |
16 | 0 |
17 | 1499983925770422892800 |
18 | 0 |
19 | 6780179728814814933811200 |
20 | 0 |
21 | 39412342523061395825857920000 |
22 | 0 |
[1,0,6,0,540,0,156240,0,96480720,0,104661849600,0, 177947471782080,0,439942718370355200,0, 1499983925770422892800,0, 6780179728814814933811200,0, 39412342523061395825857920000,0] |