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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 13 |
| 5 | 73 |
| 6 | 871782913 |
| 7 | 1307674369 |
| 8 | 62044840173323943937 |
| 9 | 33078854415193864122595302822125378214568325182093497117061192683541123570097156545925087233 |
[2,3,7,13,73,871782913,1307674369, 62044840173323943937, 33078854415193864122595302822125378214568325182093\ 497117061192683541123570097156545925087233] |