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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 19 |
| 3 | 202 |
| 4 | 3085 |
| 5 | 61886 |
| 6 | 1544029 |
| 7 | 46182900 |
| 8 | 1612759369 |
| 9 | 64455582394 |
| 10 | 2902794546961 |
| 11 | 145497909334856 |
| 12 | 8035136800888333 |
| 13 | 484821204654219798 |
| 14 | 31735810390729211173 |
| 15 | 2240132583683741633116 |
| 16 | 169624462686462529305745 |
| 17 | 13715713402047448280358002 |
| 18 | 1179576532854283015832748697 |
[1,3,19,202,3085,61886,1544029,46182900, 1612759369,64455582394,2902794546961, 145497909334856,8035136800888333, 484821204654219798,31735810390729211173, 2240132583683741633116,169624462686462529305745, 13715713402047448280358002, 1179576532854283015832748697] |