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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -4 |
| 4 | 39 |
| 5 | -580 |
| 6 | 11480 |
| 7 | -285116 |
| 8 | 8617217 |
| 9 | -311138320 |
| 10 | 13245849264 |
| 11 | -657721045720 |
| 12 | 37721447340698 |
| 13 | -2476051190767536 |
| 14 | 184449202720026868 |
| 15 | -15472664808232769104 |
| 16 | 1451318259607442040637 |
| 17 | -151254398423642331357224 |
[1,1,-4,39,-580,11480,-285116,8617217,-311138320, 13245849264,-657721045720,37721447340698, -2476051190767536,184449202720026868, -15472664808232769104,1451318259607442040637, -151254398423642331357224] |