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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 51 |
| 3 | 46218 |
| 4 | 366543984720 |
| 5 | 51580835042395388382652416 |
| 6 | 2043327387821185145142410066588796212566159639921557504 |
[4,51,46218,366543984720, 51580835042395388382652416, 20433273878211851451424100665887962125661596399215\ 57504] |