| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | -1008 |
| 3 | -58985 |
| 4 | -1048320 |
| 5 | -9764601 |
| 6 | -60462080 |
| 7 | -282458865 |
| 8 | -1073676288 |
| 9 | -3486522257 |
| 10 | -9998951424 |
| 11 | -25933230297 |
| 12 | -61900587008 |
| 13 | -137791382985 |
| 14 | -288986219520 |
| 15 | -575576648801 |
| 16 | -1095216660480 |
| 17 | -1998814031265 |
[1,3,-1008,-58985,-1048320,-9764601,-60462080, -282458865,-1073676288,-3486522257,-9998951424, -25933230297,-61900587008,-137791382985, -288986219520,-575576648801,-1095216660480, -1998814031265] |