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| n | a(n) |
|---|---|
| 1 | 71 |
| 2 | 262151 |
| 3 | 1073741831 |
| 4 | 549755813881 |
| 5 | 302231454903657293676551 |
| 6 | 85070591730234615865843651857942052871 |
| 7 | 23945242826029513411849172299223580994042798784118791 |
[71,262151,1073741831,549755813881, 302231454903657293676551, 85070591730234615865843651857942052871, 23945242826029513411849172299223580994042798784118\ 791] |