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A007505 as a simple table

na(n)
12
25
311
423
547
6191
7383
86143
9786431
1051539607551
11824633720831
1226388279066623
13108086391056891903
1455340232221128654847
15226673591177742970257407
1659421121885698253195157962751
1730423614405477505635920876929023

[2,5,11,23,47,191,383,6143,786431,51539607551,
 824633720831,26388279066623,108086391056891903,
 55340232221128654847,226673591177742970257407,
 59421121885698253195157962751,
 30423614405477505635920876929023]