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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 523 |
| 4 | 7523 |
| 5 | 751123 |
| 6 | 75311213 |
| 7 | 7523171311 |
| 8 | 753217131911 |
| 9 | 75323219131117 |
| 10 | 0 |
| 11 | 753312923219111713 |
| 12 | 75373312923192171311 |
| 13 | 7541373132923217111319 |
| 14 | 754341373132923192171311 |
| 15 | 75474341373132923211171319 |
[2,23,523,7523,751123,75311213,7523171311, 753217131911,75323219131117,0,753312923219111713, 75373312923192171311,7541373132923217111319, 754341373132923192171311, 75474341373132923211171319] |