n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | -1 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 180 |
7 | 0 |
8 | 10080 |
9 | 90720 |
10 | 0 |
11 | 0 |
12 | 179625600 |
13 | -1556755200 |
14 | -10897286400 |
15 | 326918592000 |
16 | -2615348736000 |
17 | -88921857024000 |
18 | 800296713216000 |
19 | -30411275102208000 |
20 | 152056375511040000 |
21 | 0 |
22 | -351250227430502400000 |
23 | -3231502092360622080000 |
[1,-1,-1,0,0,0,180,0,10080,90720,0,0,179625600, -1556755200,-10897286400,326918592000, -2615348736000,-88921857024000,800296713216000, -30411275102208000,152056375511040000,0, -351250227430502400000,-3231502092360622080000] |