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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12487 |
| 3 | 48091042 |
| 4 | 72606563663 |
| 5 | 112737045408576 |
| 6 | 202012748290560363 |
[1,12487,48091042,72606563663,112737045408576, 202012748290560363] |