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| n | a(n) |
|---|---|
| 1 | 2047 |
| 2 | 8388607 |
| 3 | 137438953471 |
| 4 | 2199023255551 |
| 5 | 576460752303423487 |
| 6 | 147573952589676412927 |
| 7 | 9671406556917033397649407 |
| 8 | 158456325028528675187087900671 |
| 9 | 2535301200456458802993406410751 |
[2047,8388607,137438953471,2199023255551, 576460752303423487,147573952589676412927, 9671406556917033397649407, 158456325028528675187087900671, 2535301200456458802993406410751] |