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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 31 |
| 4 | 31 |
| 5 | 97885807 |
| 6 | 7105083736241465849989 |
| 7 | 386010207538170887319192908532941 |
| 8 | 797921272502602257281628706183144343679532451 |
[2,7,31,31,97885807,7105083736241465849989, 386010207538170887319192908532941, 797921272502602257281628706183144343679532451] |