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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 324 |
| 3 | 232324 |
| 4 | 34433424 |
| 5 | 434222244 |
| 6 | 43342243344 |
| 7 | 242223434244 |
| 8 | 43323224233444 |
| 9 | 4222343433322242244 |
| 10 | 42223424423443333243223342224 |
[4,324,232324,34433424,434222244,43342243344, 242223434244,43323224233444,4222343433322242244, 42223424423443333243223342224] |