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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 88 |
| 3 | 999 |
| 4 | 9994 |
| 5 | 99995 |
| 6 | 999994 |
| 7 | 9999994 |
| 8 | 99999994 |
| 9 | 999999998 |
| 10 | 9999999995 |
| 11 | 99999999998 |
| 12 | 999999999998 |
| 13 | 9999999999998 |
| 14 | 99999999999998 |
| 15 | 999999999999995 |
| 16 | 9999999999999998 |
| 17 | 99999999999999998 |
| 18 | 999999999999999987 |
| 19 | 9999999999999999995 |
| 20 | 99999999999999999985 |
| 21 | 999999999999999999995 |
[0,88,999,9994,99995,999994,9999994,99999994, 999999998,9999999995,99999999998,999999999998, 9999999999998,99999999999998,999999999999995, 9999999999999998,99999999999999998, 999999999999999987,9999999999999999995, 99999999999999999985,999999999999999999995] |