n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 9 |
4 | 108 |
5 | 3420 |
6 | 114480 |
7 | 7786800 |
8 | 497266560 |
9 | 42616445760 |
10 | 4320959126400 |
11 | 534444478444800 |
12 | 77699101730342400 |
13 | 13282131639801024000 |
[0,1,9,108,3420,114480,7786800,497266560, 42616445760,4320959126400,534444478444800, 77699101730342400,13282131639801024000] |