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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 77 |
| 3 | 976 |
| 4 | 8876 |
| 5 | 98886 |
| 6 | 997762 |
| 7 | 9999996 |
| 8 | 99988862 |
| 9 | 999888621 |
| 10 | 9998888773 |
| 11 | 99988887731 |
| 12 | 999888877311 |
| 13 | 9998888773111 |
| 14 | 99988887731111 |
| 15 | 998888887777772 |
| 16 | 9988888877777721 |
| 17 | 99999999998777772 |
| 18 | 999999999987777721 |
| 19 | 9999999999877777211 |
| 20 | 99999999998777772111 |
[9,77,976,8876,98886,997762,9999996,99988862, 999888621,9998888773,99988887731,999888877311, 9998888773111,99988887731111,998888887777772, 9988888877777721,99999999998777772, 999999999987777721,9999999999877777211, 99999999998777772111] |