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| n | a(n) |
|---|---|
| 0 | 10 |
| 1 | 11 |
| 2 | 12 |
| 3 | 13 |
| 4 | 14 |
| 5 | 15 |
| 6 | 16 |
| 7 | 21 |
| 8 | 23 |
| 9 | 31 |
| 10 | 111 |
| 11 | 1101 |
| 12 | 1111111111111 |
[10,11,12,13,14,15,16,21,23,31,111,1101, 1111111111111] |