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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 0 |
| 3 | 3 |
| 4 | -4 |
| 5 | -25 |
| 6 | 114 |
| 7 | 287 |
| 8 | -4152 |
| 9 | 1647 |
| 10 | 192230 |
| 11 | -807961 |
| 12 | -10164804 |
| 13 | 111209111 |
| 14 | 454840554 |
| 15 | -14657978385 |
| 16 | 21202175504 |
| 17 | 1988791958879 |
| 18 | -15488971798194 |
| 19 | -260886468394153 |
| 20 | 4872247004699460 |
| 21 | 23537372210149959 |
| 22 | -1365745577227898350 |
| 23 | 4274609859520565663 |
| 24 | 364461939727273277016 |
[1,-1,0,3,-4,-25,114,287,-4152,1647,192230, -807961,-10164804,111209111,454840554, -14657978385,21202175504,1988791958879, -15488971798194,-260886468394153,4872247004699460, 23537372210149959,-1365745577227898350, 4274609859520565663,364461939727273277016] |