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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 67 |
| 3 | 354559 |
| 4 | 55140694943446374 |
| 5 | 207861305741947432194260517035962625798813317184891 |
[4,67,354559,55140694943446374, 20786130574194743219426051703596262579881331718489\ 1] |