n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 0 |
5 | 24 |
6 | 80 |
7 | 720 |
8 | 5376 |
9 | 53760 |
10 | 490752 |
11 | 6289920 |
12 | 68766720 |
13 | 1024607232 |
14 | 13520332800 |
15 | 226177695744 |
16 | 3498759290880 |
17 | 65257155624960 |
18 | 1153246338220032 |
19 | 23793010526453760 |
20 | 472374431008948224 |
21 | 10686755493583257600 |
22 | 235406405307208826880 |
[1,0,0,2,0,24,80,720,5376,53760,490752,6289920, 68766720,1024607232,13520332800,226177695744, 3498759290880,65257155624960,1153246338220032, 23793010526453760,472374431008948224, 10686755493583257600,235406405307208826880] |