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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 80089 |
| 3 | 90809009099908808089808090889 |
| 4 | 89898988900998890088080098089989880890999988989999809 |
[9,80089,90809009099908808089808090889, 89898988900998890088080098089989880890999988989999\ 809] |