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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 12 |
| 2 | 1212 |
| 3 | 121212 |
| 4 | 12121212 |
| 5 | 1212121212 |
| 6 | 121212121212 |
| 7 | 12121212121212 |
| 8 | 1212121212121212 |
| 9 | 121212121212121212 |
| 10 | 12121212121212121212 |
| 11 | 1212121212121212121212 |
| 12 | 121212121212121212121212 |
| 13 | 12121212121212121212121212 |
| 14 | 1212121212121212121212121212 |
[0,12,1212,121212,12121212,1212121212, 121212121212,12121212121212,1212121212121212, 121212121212121212,12121212121212121212, 1212121212121212121212,121212121212121212121212, 12121212121212121212121212, 1212121212121212121212121212] |