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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 19 |
| 2 | 721 |
| 3 | 27379 |
| 4 | 1039681 |
| 5 | 39480499 |
| 6 | 1499219281 |
| 7 | 56930852179 |
| 8 | 2161873163521 |
| 9 | 82094249361619 |
| 10 | 3117419602578001 |
| 11 | 118379850648602419 |
| 12 | 4495316905044313921 |
| 13 | 170703662541035326579 |
| 14 | 6482243859654298096081 |
| 15 | 246154563004322292324499 |
| 16 | 9347391150304592810234881 |
| 17 | 354954709148570204496600979 |
| 18 | 13478931556495363178060602321 |
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