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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 121 |
| 4 | 12221 |
| 5 | 12233221 |
| 6 | 122344443221 |
| 7 | 15223441414432251 |
| 8 | 15223441429655692414432251 |
[1,11,121,12221,12233221,122344443221, 15223441414432251,15223441429655692414432251] |