n | a(n) |
---|---|
1 | 1 |
2 | -2 |
3 | 2 |
4 | -4 |
5 | -4 |
6 | -48 |
7 | -336 |
8 | -2928 |
9 | -28144 |
10 | -298528 |
11 | -3454432 |
12 | -43286528 |
13 | -583835648 |
14 | -8433987584 |
15 | -129941213184 |
16 | -2127349165824 |
17 | -36889047574272 |
18 | -675548628690432 |
19 | -13030733384956416 |
20 | -264111424634864640 |
[1,-2,2,-4,-4,-48,-336,-2928,-28144,-298528, -3454432,-43286528,-583835648,-8433987584, -129941213184,-2127349165824,-36889047574272, -675548628690432,-13030733384956416, -264111424634864640] |