n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | -2 |
3 | -4 |
4 | -18 |
5 | -84 |
6 | -564 |
7 | -3984 |
8 | -33504 |
9 | -307728 |
10 | -3156192 |
11 | -35254080 |
12 | -429350400 |
13 | -5641133760 |
14 | -79720588800 |
15 | -1204747741440 |
16 | -19400679325440 |
17 | -331599765565440 |
18 | -5996988417784320 |
19 | -114408970262922240 |
20 | -2296442484579686400 |
21 | -48379417944213196800 |
[1,-1,-2,-4,-18,-84,-564,-3984,-33504,-307728, -3156192,-35254080,-429350400,-5641133760, -79720588800,-1204747741440,-19400679325440, -331599765565440,-5996988417784320, -114408970262922240,-2296442484579686400, -48379417944213196800] |