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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -15 |
| 2 | 271 |
| 3 | -7375 |
| 4 | 215191 |
| 5 | 3148665 |
| 6 | -2649191089 |
| 7 | 649131707105 |
| 8 | -146075501268569 |
| 9 | 33189954373043945 |
| 10 | -7481610904728705249 |
| 11 | 1478339075346879047185 |
| 12 | -99742476113106129277129 |
[1,-15,271,-7375,215191,3148665,-2649191089, 649131707105,-146075501268569,33189954373043945, -7481610904728705249,1478339075346879047185, -99742476113106129277129] |