A137810 - OEIS

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A137810 as a simple table

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]