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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 7 |
| 4 | 19 |
| 5 | 19 |
| 6 | 139 |
| 7 | 151 |
| 8 | 211 |
| 9 | 211 |
| 10 | 211 |
| 11 | 421 |
| 12 | 2311 |
| 13 | 2311 |
| 14 | 92401 |
| 15 | 120121 |
| 16 | 120121 |
| 17 | 180181 |
| 18 | 2312311 |
[3,7,7,19,19,139,151,211,211,211,421,2311,2311, 92401,120121,120121,180181,2312311] |