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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -3 |
| 2 | -15 |
| 3 | 357 |
| 4 | 22305 |
| 5 | -582483 |
| 6 | -217683375 |
| 7 | -2001865323 |
| 8 | 7258418490945 |
| 9 | 826442897487837 |
| 10 | -580853295560646735 |
| 11 | -204631967729205027003 |
| 12 | 85920364932388858911585 |
| 13 | 79053144190920049745846157 |
[1,-3,-15,357,22305,-582483,-217683375, -2001865323,7258418490945,826442897487837, -580853295560646735,-204631967729205027003, 85920364932388858911585, 79053144190920049745846157] |