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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 34 |
| 3 | 567 |
| 4 | 8 |
| 5 | 910 |
| 6 | 111213141516 |
| 7 | 17181920 |
| 8 | 2122232425262728 |
| 9 | 293031 |
[12,34,567,8,910,111213141516,17181920, 2122232425262728,293031] |