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A046932 as a simple table

na(n)
11
23
37
415
521
663
7127
863
973
10889
111533
123255
137905
1411811
1532767
16255
17273
18253921
19413385
20761763
215461
224194303
232088705
242097151
2510961685
26298935
27125829105
2817895697
29402653181
3010845877
312097151
321023
331057
34255652815
353681400539

[1,3,7,15,21,63,127,63,73,889,1533,3255,7905,
 11811,32767,255,273,253921,413385,761763,5461,
 4194303,2088705,2097151,10961685,298935,125829105,
 17895697,402653181,10845877,2097151,1023,1057,
 255652815,3681400539]