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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -7 |
| 3 | -31 |
| 4 | -23 |
| 5 | 2239 |
| 6 | 39889 |
| 7 | 603521 |
| 8 | -27466831 |
| 9 | -2445382081 |
| 10 | -204734091383 |
| 11 | 7545563759329 |
| 12 | 7265319037194073 |
| 13 | 2502938339020429439 |
| 14 | 404477135616551491361 |
| 15 | -932929530161758614571519 |
[1,-1,-7,-31,-23,2239,39889,603521,-27466831, -2445382081,-204734091383,7545563759329, 7265319037194073,2502938339020429439, 404477135616551491361,-932929530161758614571519] |