n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | -2 |
3 | -28 |
4 | 54 |
5 | 860 |
6 | -2004 |
7 | -33720 |
8 | 86054 |
9 | 1492908 |
10 | -4019452 |
11 | -71101832 |
12 | 198310460 |
13 | 3555617432 |
14 | -10168382696 |
15 | -184127171952 |
16 | 536496907782 |
17 | 9788598556876 |
18 | -28937139277804 |
19 | -531135371147368 |
20 | 1588378827366868 |
21 | 29295861148032584 |
[1,2,-2,-28,54,860,-2004,-33720,86054,1492908, -4019452,-71101832,198310460,3555617432, -10168382696,-184127171952,536496907782, 9788598556876,-28937139277804,-531135371147368, 1588378827366868,29295861148032584] |