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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 63 |
| 4 | 612 |
| 5 | 6777 |
| 6 | 6921 |
| 7 | 65664 |
| 8 | 639972 |
| 9 | 6169761 |
| 10 | 67166406 |
| 11 | 69677001 |
| 12 | 650797263 |
| 13 | 6332876712 |
| 14 | 61049606031 |
| 15 | 69046146387 |
| 16 | 675489481074 |
| 17 | 6547099011282 |
| 18 | 63744495662961 |
| 19 | 614866659955101 |
| 20 | 694010047953906 |
| 21 | 6792600448516563 |
[1,6,63,612,6777,6921,65664,639972,6169761, 67166406,69677001,650797263,6332876712, 61049606031,69046146387,675489481074, 6547099011282,63744495662961,614866659955101, 694010047953906,6792600448516563] |