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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 12 |
| 4 | 21 |
| 5 | 22422 |
| 6 | 24223 |
| 7 | 33333 |
| 8 | 34441524 |
| 9 | 4242436235 |
| 10 | 23443535352 |
| 11 | 34462443242 |
| 12 | 35256523324 |
| 13 | 4341535435353 |
| 14 | 4645441523344 |
| 15 | 5244526446515 |
| 16 | 5335524234335 |
[0,1,12,21,22422,24223,33333,34441524,4242436235, 23443535352,34462443242,35256523324,4341535435353, 4645441523344,5244526446515,5335524234335] |