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A105755 as a simple table

na(n)
11
23
37
415
531
663
7127
8255
9511
101013
112025
124047
138087
1416159
1532287
1664511
17128895
18257535
19514559
201028105
212054185
224104323
238200559
2416384959
2532737631
2665410751
27130692607
28261127679
29521740799
301042453493
312082852801

[1,3,7,15,31,63,127,255,511,1013,2025,4047,8087,
 16159,32287,64511,128895,257535,514559,1028105,
 2054185,4104323,8200559,16384959,32737631,
 65410751,130692607,261127679,521740799,1042453493,
 2082852801]