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A153010 as a simple table

na(n)
00
11
22
33
47
515
631
763
8127
9255
10511
111023
122047
134095
148191
1516383
1632767
1765535
18131071
19262143
20524287
211048575
222097151
234194303
248388607
2516777215
2633554431
2767108863
28134217727
29268435455
30536870911
311073741823
322147483647
334294967295

[0,1,2,3,7,15,31,63,127,255,511,1023,2047,4095,
 8191,16383,32767,65535,131071,262143,524287,
 1048575,2097151,4194303,8388607,16777215,33554431,
 67108863,134217727,268435455,536870911,1073741823,
 2147483647,4294967295]