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A139817 as a simple table

na(n)
00
11
23
37
414
530
662
7125
8253
9509
101020
112044
124092
138188
1416379
1532763
1665531
17131066
18262138
19524282
201048569
212097145
224194297
238388601
2416777208
2533554424
2667108856
27134217719
28268435447
29536870903
301073741814
312147483638
324294967286
338589934582

[0,1,3,7,14,30,62,125,253,509,1020,2044,4092,8188,
 16379,32763,65531,131066,262138,524282,1048569,
 2097145,4194297,8388601,16777208,33554424,
 67108856,134217719,268435447,536870903,1073741814,
 2147483638,4294967286,8589934582]