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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 134 |
| 3 | 1346 |
| 4 | 13468 |
| 5 | 134689 |
| 6 | 13468911 |
| 7 | 1346891112 |
| 8 | 134689111214 |
| 9 | 13468911121416 |
| 10 | 1346891112141617 |
| 11 | 134689111214161719 |
| 12 | 13468911121416171921 |
| 13 | 1346891112141617192122 |
| 14 | 134689111214161719212224 |
[1,13,134,1346,13468,134689,13468911,1346891112, 134689111214,13468911121416,1346891112141617, 134689111214161719,13468911121416171921, 1346891112141617192122,134689111214161719212224] |