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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 81 |
| 3 | 11881 |
| 4 | 13338133883881 |
| 5 | 81838388131883313833383381811133318888113813881 |
[1,81,11881,13338133883881, 81838388131883313833383381811133318888113813881] |