The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -1 |
| 3 | 8 |
| 4 | -30 |
| 5 | 102 |
| 6 | -735 |
| 7 | 6036 |
| 8 | -43372 |
| 9 | 366666 |
| 10 | -3909645 |
| 11 | 43735936 |
| 12 | -509688234 |
| 13 | 6614683246 |
| 14 | -93752033739 |
| 15 | 1403126034316 |
| 16 | -22351107663000 |
| 17 | 380878785320338 |
| 18 | -6864318972384345 |
| 19 | 130206659362724728 |
[0,2,-1,8,-30,102,-735,6036,-43372,366666, -3909645,43735936,-509688234,6614683246, -93752033739,1403126034316,-22351107663000, 380878785320338,-6864318972384345, 130206659362724728] |