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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 131 |
| 4 | 1331 |
| 5 | 13531 |
| 6 | 135531 |
| 7 | 1357531 |
| 8 | 13577531 |
| 9 | 135797531 |
| 10 | 1357997531 |
| 11 | 135791197531 |
| 12 | 13579111197531 |
| 13 | 1357911131197531 |
| 14 | 135791113131197531 |
| 15 | 13579111315131197531 |
| 16 | 1357911131515131197531 |
| 17 | 135791113151715131197531 |
| 18 | 13579111315171715131197531 |
[1,11,131,1331,13531,135531,1357531,13577531, 135797531,1357997531,135791197531,13579111197531, 1357911131197531,135791113131197531, 13579111315131197531,1357911131515131197531, 135791113151715131197531, 13579111315171715131197531] |