n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 720 |
7 | 30240 |
8 | 1088640 |
9 | 39916800 |
10 | 1556755200 |
11 | 65383718400 |
12 | 2964061900800 |
13 | 144815595724800 |
14 | 7602818775552000 |
15 | 427447366714368000 |
16 | 25646842002862080000 |
17 | 1636734826000834560000 |
18 | 110752389892723138560000 |
[0,0,0,0,0,0,720,30240,1088640,39916800, 1556755200,65383718400,2964061900800, 144815595724800,7602818775552000, 427447366714368000,25646842002862080000, 1636734826000834560000,110752389892723138560000] |