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A331733 as a simple table

na(n)
11
23
37
44
531
615
7511
812
913
1063
11131071
1228
138589934591
141023
15127
166
1736893488147419103231
1839
19680564733841876926926749214863536422911
20124
212047
22262143
23231584178474632390847141970017375815706539969331281128078915168015826259279871
2460
25121
2617179869183
2791
282044

[1,3,7,4,31,15,511,12,13,63,131071,28,8589934591,
 1023,127,6,36893488147419103231,39,
 680564733841876926926749214863536422911,124,2047,
 262143,
 23158417847463239084714197001737581570653996933128\
 1128078915168015826259279871,60,121,17179869183,
 91,2044]