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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 54 |
| 3 | 664 |
| 4 | 8625 |
| 5 | 115506 |
| 6 | 1577311 |
| 7 | 21833033 |
| 8 | 305238726 |
| 9 | 4300158499 |
| 10 | 60947481440 |
| 11 | 868075247727 |
| 12 | 12414285158328 |
| 13 | 178143045874721 |
| 14 | 2563779890825235 |
| 15 | 36989976295984049 |
| 16 | 534858504103606897 |
| 17 | 7748732574979636374 |
| 18 | 112451247125555173765 |
| 19 | 1634406098930351324291 |
[1,5,54,664,8625,115506,1577311,21833033, 305238726,4300158499,60947481440,868075247727, 12414285158328,178143045874721,2563779890825235, 36989976295984049,534858504103606897, 7748732574979636374,112451247125555173765, 1634406098930351324291] |