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A130755 as a simple table

na(n)
03
14
27
315
432
565
6129
7256
8511
91023
102048
114097
128193
1316384
1432767
1565535
16131072
17262145
18524289
191048576
202097151
214194303
228388608
2316777217
2433554433
2567108864
26134217727
27268435455
28536870912
291073741825
302147483649

[3,4,7,15,32,65,129,256,511,1023,2048,4097,8193,
 16384,32767,65535,131072,262145,524289,1048576,
 2097151,4194303,8388608,16777217,33554433,
 67108864,134217727,268435455,536870912,1073741825,
 2147483649]