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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 61 |
| 4 | 5424 |
| 5 | 488161 |
| 6 | 4068009 |
| 7 | 34868649 |
| 8 | 3254407241 |
| 9 | 305100678845 |
| 10 | 2712006034178 |
| 11 | 244080543076021 |
| 12 | 23245766007240096 |
| 13 | 2218914027963827346 |
| 14 | 203400452563350840051 |
| 15 | 19526443446081680644897 |
| 16 | 1877542639046315446624712 |
| 17 | 18080040227853408004534264 |
| 18 | 1743432450543007200437232601 |
[1,8,61,5424,488161,4068009,34868649,3254407241, 305100678845,2712006034178,244080543076021, 23245766007240096,2218914027963827346, 203400452563350840051,19526443446081680644897, 1877542639046315446624712, 18080040227853408004534264, 1743432450543007200437232601] |