n | a(n) |
---|---|
0 | 3 |
1 | -6 |
2 | 20 |
3 | -90 |
4 | 504 |
5 | -3360 |
6 | 25920 |
7 | -226800 |
8 | 2217600 |
9 | -23950080 |
10 | 283046400 |
11 | -3632428800 |
12 | 50295168000 |
13 | -747242496000 |
14 | 11856247603200 |
15 | -200074178304000 |
16 | 3577797070848000 |
17 | -67580611338240000 |
18 | 1344498478202880000 |
19 | -28100018194440192000 |
20 | 615524208068689920000 |
[3,-6,20,-90,504,-3360,25920,-226800,2217600, -23950080,283046400,-3632428800,50295168000, -747242496000,11856247603200,-200074178304000, 3577797070848000,-67580611338240000, 1344498478202880000,-28100018194440192000, 615524208068689920000] |