The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -16 |
| 3 | 488 |
| 4 | -30336 |
| 5 | 3061152 |
| 6 | -450481920 |
| 7 | 90676698240 |
| 8 | -23889578496000 |
| 9 | 7972943138664960 |
| 10 | -3286129765438771200 |
| 11 | 1638857583672607549440 |
| 12 | -972524875970827007262720 |
| 13 | 677113960144029088030433280 |
[0,2,-16,488,-30336,3061152,-450481920, 90676698240,-23889578496000,7972943138664960, -3286129765438771200,1638857583672607549440, -972524875970827007262720, 677113960144029088030433280] |