n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 0 |
4 | 30 |
5 | 0 |
6 | 13560 |
7 | 0 |
8 | 27785520 |
9 | 0 |
10 | 162030637440 |
11 | 0 |
12 | 2156625389318400 |
13 | 0 |
14 | 56857271240920550400 |
15 | 0 |
16 | 2686506065987036477184000 |
17 | 0 |
18 | 211180868835057744408834048000 |
19 | 0 |
20 | 26072812428113877344085395644416000 |
21 | 0 |
[0,1,0,30,0,13560,0,27785520,0,162030637440,0, 2156625389318400,0,56857271240920550400,0, 2686506065987036477184000,0, 211180868835057744408834048000,0, 26072812428113877344085395644416000,0] |