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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 48 |
| 3 | 489 |
| 4 | 48912 |
| 5 | 4891216 |
| 6 | 489121618 |
| 7 | 48912161820 |
| 8 | 4891216182024 |
| 9 | 489121618202425 |
| 10 | 48912161820242527 |
| 11 | 4891216182024252728 |
| 12 | 489121618202425272832 |
| 13 | 48912161820242527283236 |
[4,48,489,48912,4891216,489121618,48912161820, 4891216182024,489121618202425,48912161820242527, 4891216182024252728,489121618202425272832, 48912161820242527283236] |