n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 120 |
3 | 2100 |
4 | 45360 |
5 | 1164240 |
6 | 34594560 |
7 | 1167566400 |
8 | 44108064000 |
9 | 1843717075200 |
10 | 84475764172800 |
11 | 4209708914611200 |
12 | 226676633863680000 |
13 | 13114862387827200000 |
14 | 811372819726909440000 |
15 | 53449184499510159360000 |
16 | 3735154775612827607040000 |
[1,9,120,2100,45360,1164240,34594560,1167566400, 44108064000,1843717075200,84475764172800, 4209708914611200,226676633863680000, 13114862387827200000,811372819726909440000, 53449184499510159360000,3735154775612827607040000] |