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A288975 as a simple table

na(n)
01
13
25
315
427
563
6113
7255
8485
91023
101997
114087
128077
1316383
1432557
1565503
16130607
17262045
18523519
191048411
202095295
214194151
228384991
2316777121
2433548031
2567108137
26134202367
27268434993
28536845823
291073741109
302147420875
314294967093
328589834191

[1,3,5,15,27,63,113,255,485,1023,1997,4087,8077,
 16383,32557,65503,130607,262045,523519,1048411,
 2095295,4194151,8384991,16777121,33548031,
 67108137,134202367,268434993,536845823,1073741109,
 2147420875,4294967093,8589834191]