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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 63 |
| 3 | 2047 |
| 4 | 1048575 |
| 5 | 137438953471 |
| 6 | 1180591620717411303423 |
| 7 | 43556142965880123323311949751266331066367 |
| 8 | 29642774844752946028434172162224104410437116074403984394101141506025761187823615 |
[1,7,63,2047,1048575,137438953471, 1180591620717411303423, 43556142965880123323311949751266331066367, 29642774844752946028434172162224104410437116074403\ 984394101141506025761187823615] |