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| n | a(n) |
|---|---|
| 1 | 990 |
| 2 | 2090209222020090 |
| 3 | 92209290022092090 |
| 4 | 200290202090990220 |
| 5 | 222020200990922029290 |
[990,2090209222020090,92209290022092090, 200290202090990220,222020200990922029290] |