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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 5 |
| 2 | 17 |
| 3 | 72 |
| 4 | 341 |
| 5 | 1729 |
| 6 | 9180 |
| 7 | 50388 |
| 8 | 283613 |
| 9 | 1628055 |
| 10 | 9494745 |
| 11 | 56097600 |
| 12 | 335064492 |
| 13 | 2019862412 |
| 14 | 12273294568 |
| 15 | 75092100732 |
| 16 | 462223930605 |
| 17 | 2860429251715 |
| 18 | 17785916026515 |
| 19 | 111063871574040 |
| 20 | 696206462636685 |
| 21 | 4379403076484625 |
| 22 | 27635514370180080 |
[3,5,17,72,341,1729,9180,50388,283613,1628055, 9494745,56097600,335064492,2019862412,12273294568, 75092100732,462223930605,2860429251715, 17785916026515,111063871574040,696206462636685, 4379403076484625,27635514370180080] |