n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 16 |
4 | 144 |
5 | 768 |
6 | 10560 |
7 | 92160 |
8 | 1585920 |
9 | 21127680 |
10 | 419973120 |
11 | 7431782400 |
12 | 177081569280 |
13 | 3923981107200 |
14 | 105929096232960 |
15 | 2868863206809600 |
16 | 87449689674547200 |
17 | 2742391916199936000 |
18 | 94359281224797388800 |
19 | 3356687705428721664000 |
[1,2,4,16,144,768,10560,92160,1585920,21127680, 419973120,7431782400,177081569280,3923981107200, 105929096232960,2868863206809600, 87449689674547200,2742391916199936000, 94359281224797388800,3356687705428721664000] |