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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 64 |
| 4 | 1024 |
| 5 | 32647 |
| 6 | 2077283 |
| 7 | 263764474 |
| 8 | 66791728160 |
| 9 | 33709469463080 |
| 10 | 33913901896235535 |
| 11 | 68015432587509271039 |
[1,2,8,64,1024,32647,2077283,263764474, 66791728160,33709469463080,33913901896235535, 68015432587509271039] |