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A141775 as a simple table

na(n)
01
13
25
38
415
531
664
7129
8257
9512
101023
112047
124096
138193
1416385
1532768
1665535
17131071
18262144
19524289
201048577
212097152
224194303
238388607
2416777216
2533554433
2667108865
27134217728
28268435455
29536870911
301073741824
312147483649
324294967297
338589934592
3417179869183

[1,3,5,8,15,31,64,129,257,512,1023,2047,4096,8193,
 16385,32768,65535,131071,262144,524289,1048577,
 2097152,4194303,8388607,16777216,33554433,
 67108865,134217728,268435455,536870911,1073741824,
 2147483649,4294967297,8589934592,17179869183]