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| n | a(n) |
|---|---|
| 1 | 31 |
| 2 | 71 |
| 3 | 311 |
| 4 | 1511 |
| 5 | 112111 |
| 6 | 1171111 |
| 7 | 11131111 |
| 8 | 71111111 |
| 9 | 131111111 |
| 10 | 1115111111 |
| 11 | 31111111111 |
| 12 | 131111111111111111 |
| 13 | 1151111111111111111111111111 |
| 14 | 11111111111711111111111111111 |
| 15 | 131111111111111111111111111111111111111 |
[31,71,311,1511,112111,1171111,11131111,71111111, 131111111,1115111111,31111111111, 131111111111111111,1151111111111111111111111111, 11111111111711111111111111111, 131111111111111111111111111111111111111] |