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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 27 |
| 4 | 387 |
| 5 | 7317 |
| 6 | 168237 |
| 7 | 4503789 |
| 8 | 136727055 |
| 9 | 4625789067 |
| 10 | 172276066539 |
| 11 | 6998043525885 |
| 12 | 307831417695909 |
| 13 | 14577640870303377 |
| 14 | 739536100222798899 |
| 15 | 40020776276242083507 |
| 16 | 2301691209030102539259 |
| 17 | 140217912528862509036117 |
| 18 | 9021108445527923796514437 |
| 19 | 611285061740709140815872789 |
[1,1,3,27,387,7317,168237,4503789,136727055, 4625789067,172276066539,6998043525885, 307831417695909,14577640870303377, 739536100222798899,40020776276242083507, 2301691209030102539259,140217912528862509036117, 9021108445527923796514437, 611285061740709140815872789] |