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A350370 as a simple table

na(n)
11
23
37
415
527
6127
7255
8511
91023
101819
114095
124255
1316383
1432767
1565535
1677671
17262143
18459759
191048575
202097151
214194303
227456539
2316777215
2433554431
2567108863
26125687199
271073741823
282147483647
294294967295
308589934591
3117179869183
3220361326439
3368719476735

[1,3,7,15,27,127,255,511,1023,1819,4095,4255,
 16383,32767,65535,77671,262143,459759,1048575,
 2097151,4194303,7456539,16777215,33554431,
 67108863,125687199,1073741823,2147483647,
 4294967295,8589934591,17179869183,20361326439,
 68719476735]