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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 77 |
| 3 | 924 |
| 4 | 7700770 |
| 5 | 3303388088 |
| 6 | 99992299992 |
| 7 | 88888803333330 |
| 8 | 777777007777770 |
| 9 | 999999924 |
| 10 | 7777777700777777770 |
| 11 | 3333333303388888888088 |
| 12 | 99999999992299999999992 |
| 13 | 88888888888803333333333330 |
| 14 | 777777777777007777777777770 |
| 15 | 999999999999924 |
[0,77,924,7700770,3303388088,99992299992, 88888803333330,777777007777770,999999924, 7777777700777777770,3333333303388888888088, 99999999992299999999992, 88888888888803333333333330, 777777777777007777777777770,999999999999924] |