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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 313 |
| 3 | 3135313 |
| 4 | 313531363135313 |
| 5 | 31353136313531307313531363135313 |
| 6 | 313531363135313073135313631353131531353136313531307313531363135313 |
[3,313,3135313,313531363135313, 31353136313531307313531363135313, 31353136313531307313531363135313153135313631353130\ 7313531363135313] |