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| n | a(n) |
|---|---|
| 1 | 256692580 |
| 2 | 618727630440 |
| 3 | 1161408617136336 |
| 4 | 1815101219263424368 |
| 5 | 2520284777347122442980 |
[256692580,618727630440,1161408617136336, 1815101219263424368,2520284777347122442980] |