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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 81 |
| 3 | 881 |
| 4 | 8881 |
| 5 | 88881 |
| 6 | 888881 |
| 7 | 8888881 |
| 8 | 88888881 |
| 9 | 888888881 |
| 10 | 8888888881 |
| 11 | 88888888881 |
| 12 | 888888888881 |
| 13 | 8888888888881 |
| 14 | 88888888888881 |
| 15 | 888888888888881 |
| 16 | 8888888888888881 |
| 17 | 88888888888888881 |
| 18 | 888888888888888881 |
| 19 | 8888888888888888881 |
| 20 | 88888888888888888881 |
| 21 | 888888888888888888881 |
[1,81,881,8881,88881,888881,8888881,88888881, 888888881,8888888881,88888888881,888888888881, 8888888888881,88888888888881,888888888888881, 8888888888888881,88888888888888881, 888888888888888881,8888888888888888881, 88888888888888888881,888888888888888888881] |