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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | -2 |
| 2 | 14 |
| 3 | 484 |
| 4 | 9230 |
| 5 | 153748 |
| 6 | 2434964 |
| 7 | 37748520 |
| 8 | 580043790 |
| 9 | 8886848740 |
| 10 | 136151207764 |
| 11 | 2088760285456 |
| 12 | 32108266614164 |
| 13 | 494648505828904 |
| 14 | 7637081136832840 |
| 15 | 118158193386475984 |
| 16 | 1831647087068431374 |
| 17 | 28444051172077725444 |
| 18 | 442429676097305612324 |
[-1,-2,14,484,9230,153748,2434964,37748520, 580043790,8886848740,136151207764,2088760285456, 32108266614164,494648505828904,7637081136832840, 118158193386475984,1831647087068431374, 28444051172077725444,442429676097305612324] |