n | a(n) |
---|---|
2 | 0 |
3 | -2 |
4 | 1 |
5 | -2 |
6 | -72 |
7 | -672 |
8 | 136 |
9 | 4352 |
10 | -265600 |
11 | 602048 |
12 | 2658941440 |
13 | 128532940800 |
14 | 7138246144 |
15 | -277070036992 |
16 | -5928696847474688 |
17 | 140393397382594560 |
18 | -476899996446720000 |
19 | 73073105939334987776 |
20 | -197109670210161672192 |
[0,-2,1,-2,-72,-672,136,4352,-265600,602048, 2658941440,128532940800,7138246144,-277070036992, -5928696847474688,140393397382594560, -476899996446720000,73073105939334987776, -197109670210161672192] |