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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 130 |
| 4 | 1405356 |
| 5 | 1562213810837338320 |
| 6 | 2158825686366774339300670602049660137591425240817835142 |
[3,7,130,1405356,1562213810837338320, 21588256863667743393006706020496601375914252408178\ 35142] |