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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 999 |
| 4 | 999999 |
| 5 | 258474852 |
| 6 | 999999999 |
| 7 | 999999999999 |
| 8 | 999999999999999 |
| 9 | 999999999999999999 |
| 10 | 999999999999999999999 |
| 11 | 999999999999999999999999 |
| 12 | 999999999999999999999999999 |
| 13 | 999999999999999999999999999999 |
| 14 | 999999999999999999999999999999999 |
[0,7,999,999999,258474852,999999999,999999999999, 999999999999999,999999999999999999, 999999999999999999999,999999999999999999999999, 999999999999999999999999999, 999999999999999999999999999999, 999999999999999999999999999999999] |