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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 64 |
| 5 | 1024 |
| 6 | 32767 |
| 7 | 2096731 |
| 8 | 268232643 |
| 9 | 68572495926 |
| 10 | 35005772219631 |
| 11 | 35642624717803839 |
[1,2,8,64,1024,32767,2096731,268232643, 68572495926,35005772219631,35642624717803839] |