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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 49 |
| 4 | 484 |
| 5 | 4489 |
| 6 | 44944 |
| 7 | 444889 |
| 8 | 499849 |
| 9 | 44448889 |
| 10 | 449948944 |
| 11 | 4444488889 |
| 12 | 444444888889 |
| 13 | 949488489889 |
| 14 | 9988488448849 |
| 15 | 44444448888889 |
| 16 | 99488994489889 |
| 17 | 449448988844944 |
| 18 | 4444444488888889 |
| 19 | 44484944448898849 |
| 20 | 444444444888888889 |
| 21 | 948449484498898944 |
| 22 | 44444444448888888889 |
[4,9,49,484,4489,44944,444889,499849,44448889, 449948944,4444488889,444444888889,949488489889, 9988488448849,44444448888889,99488994489889, 449448988844944,4444444488888889, 44484944448898849,444444444888888889, 948449484498898944,44444444448888888889] |