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| n | a(n) |
|---|---|
| 1 | 15015804 |
| 2 | 4174580535 |
| 3 | 1225171069740 |
| 4 | 322734860977140 |
| 5 | 87856146496713616 |
| 6 | 24056313371018644679 |
[15015804,4174580535,1225171069740, 322734860977140,87856146496713616, 24056313371018644679] |