n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | 2 |
4 | 4 |
5 | 36 |
6 | 144 |
7 | 1440 |
8 | 8640 |
9 | 100800 |
10 | 806400 |
11 | 10886400 |
12 | 108864000 |
13 | 1676505600 |
14 | 20118067200 |
15 | 348713164800 |
16 | 4881984307200 |
17 | 94152554496000 |
18 | 1506440871936000 |
19 | 32011868528640000 |
20 | 576213633515520000 |
21 | 13380961044971520000 |
22 | 267619220899430400000 |
[0,1,0,2,4,36,144,1440,8640,100800,806400, 10886400,108864000,1676505600,20118067200, 348713164800,4881984307200,94152554496000, 1506440871936000,32011868528640000, 576213633515520000,13380961044971520000, 267619220899430400000] |