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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 47 |
| 4 | 141 |
| 5 | 178481 |
| 6 | 535443 |
| 7 | 2796203 |
| 8 | 8388607 |
| 9 | 8388609 |
| 10 | 25165821 |
| 11 | 131421541 |
| 12 | 394264623 |
| 13 | 499069107643 |
| 14 | 1497207322929 |
| 15 | 23456248059221 |
| 16 | 70368744177663 |
[1,3,47,141,178481,535443,2796203,8388607,8388609, 25165821,131421541,394264623,499069107643, 1497207322929,23456248059221,70368744177663] |