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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -3 |
| 3 | 69 |
| 4 | -1159 |
| 5 | 115081 |
| 6 | -3250827 |
| 7 | 1156388557 |
| 8 | -12628752143 |
| 9 | 42394317198097 |
| 10 | 2830775181039853 |
| 11 | 4335882574518729045 |
| 12 | 967557162609958010985 |
| 13 | 1031578849176135526526105 |
[1,1,-3,69,-1159,115081,-3250827,1156388557, -12628752143,42394317198097,2830775181039853, 4335882574518729045,967557162609958010985, 1031578849176135526526105] |