n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 120 |
6 | 720 |
7 | 10080 |
8 | 120960 |
9 | 1451520 |
10 | 21772800 |
11 | 359251200 |
12 | 6227020800 |
13 | 118313395200 |
14 | 2440992153600 |
15 | 53614649088000 |
16 | 1255367393280000 |
17 | 31300493672448000 |
18 | 825906208038912000 |
[0,1,0,0,24,120,720,10080,120960,1451520,21772800, 359251200,6227020800,118313395200,2440992153600, 53614649088000,1255367393280000,31300493672448000, 825906208038912000] |