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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 1147 |
| 4 | 211965 |
| 5 | 143331811 |
| 6 | 366753209781 |
[1,21,1147,211965,143331811,366753209781] |