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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 10 |
| 2 | 25 |
| 3 | 39 |
| 4 | 77 |
| 5 | 679 |
| 6 | 6788 |
| 7 | 68889 |
| 8 | 2677889 |
| 9 | 26888999 |
| 10 | 3778889989 |
| 11 | 277777788888899 |
[0,10,25,39,77,679,6788,68889,2677889,26888999, 3778889989,277777788888899] |