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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 57 |
| 3 | 511 |
| 4 | 4849 |
| 5 | 47607 |
| 6 | 477609 |
| 7 | 4862319 |
| 8 | 50026977 |
| 9 | 518839783 |
| 10 | 5414767897 |
| 11 | 56795795679 |
| 12 | 598213529809 |
| 13 | 6322787125207 |
| 14 | 67026654455433 |
| 15 | 712352213507151 |
| 16 | 7587639773475777 |
| 17 | 80977812878889927 |
| 18 | 865716569022673401 |
| 19 | 9269461606674304959 |
| 20 | 99387936492243451569 |
| 21 | 1066975862517563301303 |
[1,7,57,511,4849,47607,477609,4862319,50026977, 518839783,5414767897,56795795679,598213529809, 6322787125207,67026654455433,712352213507151, 7587639773475777,80977812878889927, 865716569022673401,9269461606674304959, 99387936492243451569,1066975862517563301303] |