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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 44 |
| 3 | 484 |
| 4 | 48884 |
| 5 | 488888884 |
| 6 | 48778998889987784 |
| 7 | 487789988899877888778998889987784 |
[4,44,484,48884,488888884,48778998889987784, 487789988899877888778998889987784] |