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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 999 |
| 4 | 19999999 |
| 5 | 89999999999999 |
| 6 | 999999999999999999999999 |
| 7 | 199999999999999999999999999999999999999 |
| 8 | 899999999999999999999999999999999999999999999999999999999 |
[0,1,8,999,19999999,89999999999999, 999999999999999999999999, 199999999999999999999999999999999999999, 89999999999999999999999999999999999999999999999999\ 9999999] |