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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 31 |
| 3 | 331 |
| 4 | 832757 |
| 5 | 2683591 |
| 6 | 6363925717 |
| 7 | 1478441195963 |
| 8 | 8996779470869 |
[2,31,331,832757,2683591,6363925717,1478441195963, 8996779470869] |