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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 3 |
| 4 | 63 |
| 5 | 15 |
| 6 | 3 |
| 7 | 4095 |
| 8 | 1073741823 |
| 9 | 268435455 |
| 10 | 262143 |
| 11 | 1048575 |
| 12 | 8191 |
| 13 | 77371252455336267181195263 |
| 14 | 36893488147419103231 |
[1,3,3,63,15,3,4095,1073741823,268435455,262143, 1048575,8191,77371252455336267181195263, 36893488147419103231] |