| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | -3 |
| 4 | 12 |
| 5 | -25 |
| 6 | -15 |
| 7 | 623 |
| 8 | -4592 |
| 9 | 18909 |
| 10 | 17595 |
| 11 | -1233551 |
| 12 | 13641276 |
| 13 | -81119597 |
| 14 | -105681667 |
| 15 | 10102782675 |
| 16 | -148962722880 |
| 17 | 1158387845177 |
| 18 | 1940315387607 |
| 19 | -234950313889819 |
| 20 | 4330346354150860 |
| 21 | -41597707520306049 |
| 22 | -85160442362115351 |
[0,1,-1,-3,12,-25,-15,623,-4592,18909,17595, -1233551,13641276,-81119597,-105681667, 10102782675,-148962722880,1158387845177, 1940315387607,-234950313889819,4330346354150860, -41597707520306049,-85160442362115351] |