The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | -20 |
| 3 | 188 |
| 4 | 5260 |
| 5 | -6244 |
| 6 | -2601620 |
| 7 | -32352772 |
| 8 | 1819651660 |
| 9 | 70205109596 |
| 10 | -1222831819220 |
| 11 | -150917074955332 |
| 12 | -1035896603485940 |
| 13 | 350980640716235036 |
| 14 | 12868008338514067180 |
| 15 | -796662150577236175492 |
[1,-4,-20,188,5260,-6244,-2601620,-32352772, 1819651660,70205109596,-1222831819220, -150917074955332,-1035896603485940, 350980640716235036,12868008338514067180, -796662150577236175492] |