n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 8 |
4 | 56 |
5 | 336 |
6 | 2496 |
7 | 19968 |
8 | 181248 |
9 | 1812480 |
10 | 19956480 |
11 | 239477760 |
12 | 3113487360 |
13 | 43588823040 |
14 | 653836861440 |
15 | 10461389783040 |
16 | 177843708887040 |
17 | 3201186759966720 |
18 | 60822550111518720 |
19 | 1216451002230374400 |
[0,0,2,8,56,336,2496,19968,181248,1812480, 19956480,239477760,3113487360,43588823040, 653836861440,10461389783040,177843708887040, 3201186759966720,60822550111518720, 1216451002230374400] |