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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 1213 |
| 3 | 12131214 |
| 4 | 1213121412131215 |
| 5 | 12131214121312151213121412131216 |
| 6 | 1213121412131215121312141213121612131214121312151213121412131217 |
[1,12,1213,12131214,1213121412131215, 12131214121312151213121412131216, 12131214121312151213121412131216121312141213121512\ 13121412131217] |