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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -3 |
| 2 | 17 |
| 3 | -259 |
| 4 | 961 |
| 5 | 8349 |
| 6 | -420847 |
| 7 | 107714525 |
| 8 | -291144191 |
| 9 | -71679177795 |
| 10 | -2546217250159 |
| 11 | -1636072819714243 |
| 12 | -8332868001077567 |
| 13 | 9423739309853690205 |
| 14 | 688800640548102542225 |
| 15 | 203496392515640478835997 |
[1,-3,17,-259,961,8349,-420847,107714525, -291144191,-71679177795,-2546217250159, -1636072819714243,-8332868001077567, 9423739309853690205,688800640548102542225, 203496392515640478835997] |