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A289402 as a simple table

na(n)
01
12
26
315
430
561
6127
7255
8508
91023
102039
114091
128191
1316382
1432765
1565518
16131062
17262143
18524156
191048571
202097119
214194238
228388221
2316777139
2433554383
2567108607
26134216063
27268435391
28536870819
291073740223
302147483326
314294967295
328589934591

[1,2,6,15,30,61,127,255,508,1023,2039,4091,8191,
 16382,32765,65518,131062,262143,524156,1048571,
 2097119,4194238,8388221,16777139,33554383,
 67108607,134216063,268435391,536870819,1073740223,
 2147483326,4294967295,8589934591]