n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 720 |
7 | 10080 |
8 | 241920 |
9 | 5080320 |
10 | 108864000 |
11 | 2474841600 |
12 | 60833203200 |
13 | 1569209241600 |
14 | 42978897561600 |
15 | 1265828788224000 |
16 | 38916389191680000 |
17 | 1280474741145600000 |
18 | 44189183316934656000 |
[2,2,0,0,0,720,10080,241920,5080320,108864000, 2474841600,60833203200,1569209241600, 42978897561600,1265828788224000,38916389191680000, 1280474741145600000,44189183316934656000] |