n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | 3 |
4 | -12 |
5 | 68 |
6 | -480 |
7 | 4144 |
8 | -42112 |
9 | 494360 |
10 | -6581880 |
11 | 98079696 |
12 | -1617373296 |
13 | 29245459176 |
14 | -575367843960 |
15 | 12235339942344 |
16 | -279650131845120 |
17 | 6836254328079936 |
18 | -177979145883651648 |
19 | 4916243253642325056 |
20 | -143602294106947553280 |
21 | 4422411460743707222784 |
[0,1,-1,3,-12,68,-480,4144,-42112,494360,-6581880, 98079696,-1617373296,29245459176,-575367843960, 12235339942344,-279650131845120,6836254328079936, -177979145883651648,4916243253642325056, -143602294106947553280,4422411460743707222784] |