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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 12 |
| 4 | 23 |
| 5 | 32 |
| 6 | 43 |
| 7 | 232 |
| 8 | 243 |
| 9 | 412 |
| 10 | 423 |
| 11 | 2232 |
| 12 | 4412 |
| 13 | 4423 |
| 14 | 22232 |
| 15 | 222232 |
[2,3,12,23,32,43,232,243,412,423,2232,4412,4423, 22232,222232] |