n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | -3 |
4 | 20 |
5 | -90 |
6 | 594 |
7 | -4200 |
8 | 34544 |
9 | -316008 |
10 | 3207240 |
11 | -35699400 |
12 | 432690312 |
13 | -5672581200 |
14 | 79991160144 |
15 | -1207367605080 |
16 | 19423062612480 |
17 | -331770360922560 |
18 | 5997105160795584 |
19 | -114373526841360000 |
20 | 2295170834453089920 |
21 | -48344592370577247360 |
[1,0,2,-3,20,-90,594,-4200,34544,-316008,3207240, -35699400,432690312,-5672581200,79991160144, -1207367605080,19423062612480,-331770360922560, 5997105160795584,-114373526841360000, 2295170834453089920,-48344592370577247360] |