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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 41 |
| 4 | 670 |
| 5 | 15717 |
| 6 | 492112 |
| 7 | 19610565 |
| 8 | 961547874 |
| 9 | 56562256041 |
| 10 | 3914022281500 |
| 11 | 313638627550657 |
| 12 | 28730918805512678 |
| 13 | 2976543225606178893 |
| 14 | 345587228510915829224 |
| 15 | 44615408909143456529309 |
| 16 | 6361213086726610526079402 |
| 17 | 995709801367376369056571089 |
[1,4,41,670,15717,492112,19610565,961547874, 56562256041,3914022281500,313638627550657, 28730918805512678,2976543225606178893, 345587228510915829224,44615408909143456529309, 6361213086726610526079402, 995709801367376369056571089] |