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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 50 |
| 5 | 561 |
| 6 | 10372 |
| 7 | 243678 |
| 8 | 7202490 |
| 9 | 247156839 |
| 10 | 9762800723 |
| 11 | 440697781180 |
| 12 | 22158315689027 |
| 13 | 1229209301535779 |
| 14 | 75088178610750205 |
| 15 | 4978494160384332078 |
| 16 | 356259456157306682274 |
| 17 | 27485448424107064539043 |
| 18 | 2265348987116189301685523 |
| 19 | 198721340483996173886242478 |
| 20 | 18537738405130256739553691845 |
[1,2,5,50,561,10372,243678,7202490,247156839, 9762800723,440697781180,22158315689027, 1229209301535779,75088178610750205, 4978494160384332078,356259456157306682274, 27485448424107064539043,2265348987116189301685523, 198721340483996173886242478, 18537738405130256739553691845] |