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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 11 |
| 3 | 47 |
| 4 | 575 |
| 5 | 27647 |
| 6 | 15925247 |
| 7 | 440301256703 |
| 8 | 7011906707722862591 |
| 9 | 3087351335301583621409910816767 |
| 10 | 21648219537098310851336266290644502090473753542655 |
[2,3,11,47,575,27647,15925247,440301256703, 7011906707722862591, 3087351335301583621409910816767, 21648219537098310851336266290644502090473753542655\ ] |