The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 15 |
| 4 | -124 |
| 5 | 1285 |
| 6 | -16026 |
| 7 | 233135 |
| 8 | -3875768 |
| 9 | 72487593 |
| 10 | -1506355510 |
| 11 | 34433714755 |
| 12 | -858675022932 |
| 13 | 23197217353661 |
| 14 | -674881675961234 |
| 15 | 21036941762791575 |
| 16 | -699465496639029616 |
| 17 | 24710351707159115089 |
| 18 | -924304656631807218798 |
| 19 | 36494922945480344959595 |
[1,-2,15,-124,1285,-16026,233135,-3875768, 72487593,-1506355510,34433714755,-858675022932, 23197217353661,-674881675961234,21036941762791575, -699465496639029616,24710351707159115089, -924304656631807218798,36494922945480344959595] |