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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 137 |
| 4 | 1379 |
| 5 | 137913 |
| 6 | 13791315 |
| 7 | 1379131521 |
| 8 | 137913152125 |
| 9 | 13791315212531 |
| 10 | 1379131521253133 |
| 11 | 137913152125313337 |
| 12 | 13791315212531333743 |
| 13 | 1379131521253133374349 |
| 14 | 137913152125313337434951 |
| 15 | 13791315212531333743495163 |
| 16 | 1379131521253133374349516367 |
[1,13,137,1379,137913,13791315,1379131521, 137913152125,13791315212531,1379131521253133, 137913152125313337,13791315212531333743, 1379131521253133374349,137913152125313337434951, 13791315212531333743495163, 1379131521253133374349516367] |