n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 120 |
6 | 720 |
7 | 4620 |
8 | 33600 |
9 | 276192 |
10 | 2540160 |
11 | 25874640 |
12 | 289301760 |
13 | 3523208832 |
14 | 46425899520 |
15 | 658169366400 |
16 | 9988896153600 |
17 | 161590513766400 |
18 | 2775695618949120 |
19 | 50455787382604800 |
20 | 967644983144448000 |
[0,0,0,0,0,120,720,4620,33600,276192,2540160, 25874640,289301760,3523208832,46425899520, 658169366400,9988896153600,161590513766400, 2775695618949120,50455787382604800, 967644983144448000] |