n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 0 |
4 | 48 |
5 | 120 |
6 | 4560 |
7 | 35700 |
8 | 1048992 |
9 | 15514128 |
10 | 456726240 |
11 | 10073339100 |
12 | 323266492560 |
13 | 9361060088952 |
14 | 336767513038320 |
15 | 11913610172869860 |
16 | 482920107426039360 |
17 | 19998225191360977440 |
18 | 909512248720724321472 |
[0,2,0,48,120,4560,35700,1048992,15514128, 456726240,10073339100,323266492560,9361060088952, 336767513038320,11913610172869860, 482920107426039360,19998225191360977440, 909512248720724321472] |