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A239678 as a simple table

na(n)
03
14
22
31
43
57
615
731
863
9127
10255
11511
121023
132047
144095
158191
1616383
1732767
1865535
19131071
20262143
21524287
221048575
232097151
244194303
258388607
2616777215
2733554431
2867108863
29134217727
30268435455
31536870911
321073741823
332147483647
344294967295

[3,4,2,1,3,7,15,31,63,127,255,511,1023,2047,4095,
 8191,16383,32767,65535,131071,262143,524287,
 1048575,2097151,4194303,8388607,16777215,33554431,
 67108863,134217727,268435455,536870911,1073741823,
 2147483647,4294967295]