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A062510 as a simple table

na(n)
00
13
23
39
415
533
663
7129
8255
9513
101023
112049
124095
138193
1416383
1532769
1665535
17131073
18262143
19524289
201048575
212097153
224194303
238388609
2416777215
2533554433
2667108863
27134217729
28268435455
29536870913
301073741823
312147483649

[0,3,3,9,15,33,63,129,255,513,1023,2049,4095,8193,
 16383,32769,65535,131073,262143,524289,1048575,
 2097153,4194303,8388609,16777215,33554433,
 67108863,134217729,268435455,536870913,1073741823,
 2147483649]