n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 168 |
4 | 1080 |
5 | 7920 |
6 | 65520 |
7 | 604800 |
8 | 6168960 |
9 | 68947200 |
10 | 838252800 |
11 | 11017036800 |
12 | 155675520000 |
13 | 2353813862400 |
14 | 37922556672000 |
15 | 648606486528000 |
16 | 11737685127168000 |
17 | 224083079700480000 |
18 | 4500868715126784000 |
[1,6,30,168,1080,7920,65520,604800,6168960, 68947200,838252800,11017036800,155675520000, 2353813862400,37922556672000,648606486528000, 11737685127168000,224083079700480000, 4500868715126784000] |