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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 77 |
| 4 | 1519 |
| 5 | 12987 |
| 6 | 111035 |
| 7 | 2190397 |
| 8 | 18727245 |
| 9 | 160112393 |
| 10 | 3158550955 |
| 11 | 27004674303 |
| 12 | 230881959671 |
| 13 | 4554628286713 |
| 14 | 38940721617681 |
| 15 | 332931625733189 |
| 16 | 6567770830889191 |
| 17 | 56152493568021699 |
| 18 | 480087173425298867 |
| 19 | 9470720983513926709 |
| 20 | 80971856784365672277 |
[1,9,77,1519,12987,111035,2190397,18727245, 160112393,3158550955,27004674303,230881959671, 4554628286713,38940721617681,332931625733189, 6567770830889191,56152493568021699, 480087173425298867,9470720983513926709, 80971856784365672277] |