n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | -4 |
3 | 24 |
4 | -96 |
5 | 0 |
6 | 5760 |
7 | -80640 |
8 | 645120 |
9 | 0 |
10 | -116121600 |
11 | 2554675200 |
12 | -30656102400 |
13 | 0 |
14 | 11158821273600 |
15 | -334764638208000 |
16 | 5356234211328000 |
17 | 0 |
18 | -3278015337332736000 |
19 | 124564582818643968000 |
20 | -2491291656372879360000 |
21 | 0 |
[1,0,-4,24,-96,0,5760,-80640,645120,0,-116121600, 2554675200,-30656102400,0,11158821273600, -334764638208000,5356234211328000,0, -3278015337332736000,124564582818643968000, -2491291656372879360000,0] |