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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -11 |
| 3 | -301 |
| 4 | -16631 |
| 5 | -1620601 |
| 6 | -250557251 |
| 7 | -56629836901 |
| 8 | -17602836565871 |
| 9 | -7193368568377201 |
| 10 | -3735581618747946491 |
| 11 | -2401310609311293289501 |
| 12 | -1871136400199563216523111 |
[1,-1,-11,-301,-16631,-1620601,-250557251, -56629836901,-17602836565871,-7193368568377201, -3735581618747946491,-2401310609311293289501, -1871136400199563216523111] |