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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 456 |
| 3 | 27780 |
| 4 | 1691690 |
| 5 | 103015508 |
| 6 | 6273056950 |
| 7 | 381992581548 |
| 8 | 23261112447444 |
| 9 | 1416465537909008 |
| 10 | 86254456382365422 |
| 11 | 5252391281433321840 |
| 12 | 319839870650458477666 |
| 13 | 19476375116903366115612 |
| 14 | 1185997189541765630381252 |
| 15 | 72220283556802506132778356 |
| 16 | 4397792341346509099717980618 |
| 17 | 267799799794395524429805470412 |
| 18 | 16307439552264147863293668460374 |
[8,456,27780,1691690,103015508,6273056950, 381992581548,23261112447444,1416465537909008, 86254456382365422,5252391281433321840, 319839870650458477666,19476375116903366115612, 1185997189541765630381252, 72220283556802506132778356, 4397792341346509099717980618, 267799799794395524429805470412, 16307439552264147863293668460374] |