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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 9 |
| 3 | -201 |
| 4 | 8369 |
| 5 | -559601 |
| 6 | 54852729 |
| 7 | -7411089401 |
| 8 | 1320161221089 |
| 9 | -299803443573601 |
| 10 | 84543945702681449 |
| 11 | -28984920596097196201 |
| 12 | 11872728882101557841809 |
| 13 | -5726623333843769342341201 |
[1,-1,9,-201,8369,-559601,54852729,-7411089401, 1320161221089,-299803443573601,84543945702681449, -28984920596097196201,11872728882101557841809, -5726623333843769342341201] |