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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | -3 |
| 2 | 7 |
| 3 | 513 |
| 4 | 13983 |
| 5 | 357857 |
| 6 | 9546255 |
| 7 | 272475249 |
| 8 | 8375575711 |
| 9 | 277269756129 |
| 10 | 9862141508151 |
| 11 | 375700268413577 |
| 12 | 15277275236695743 |
| 13 | 660913009555809345 |
| 14 | 30322968902771794975 |
| 15 | 1471145239418922932193 |
| 16 | 75269422312346702251455 |
[-1,-3,7,513,13983,357857,9546255,272475249, 8375575711,277269756129,9862141508151, 375700268413577,15277275236695743, 660913009555809345,30322968902771794975, 1471145239418922932193,75269422312346702251455] |