n | a(n) |
---|---|
0 | 1 |
1 | -24 |
2 | 252 |
3 | -1520 |
4 | 5982 |
5 | -18240 |
6 | 57320 |
7 | -198192 |
8 | 604389 |
9 | -1567840 |
10 | 4210116 |
11 | -12229632 |
12 | 32349958 |
13 | -77844000 |
14 | 196563240 |
15 | -510760752 |
16 | 1233110610 |
17 | -2871650184 |
18 | 6899741020 |
19 | -16499031456 |
20 | 37934952672 |
21 | -86122235648 |
[1,-24,252,-1520,5982,-18240,57320,-198192,604389, -1567840,4210116,-12229632,32349958,-77844000, 196563240,-510760752,1233110610,-2871650184, 6899741020,-16499031456,37934952672,-86122235648] |