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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 13 |
| 3 | 457 |
| 4 | 68917 |
| 5 | 1011121343 |
| 6 | 141516181921 |
| 7 | 20222324252639 |
| 8 | 2728293031323347 |
| 9 | 343536373840414259 |
| 10 | 44454648495051525371 |
| 11 | 5455565758606162636499 |
| 12 | 6566676869707273747576217 |
| 13 | 777879808182838485868788203 |
[2,13,457,68917,1011121343,141516181921, 20222324252639,2728293031323347, 343536373840414259,44454648495051525371, 5455565758606162636499,6566676869707273747576217, 777879808182838485868788203] |