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A243071 as a simple table

na(n)
10
21
33
42
57
66
715
84
95
1014
1131
1212
1363
1430
1513
168
17127
1810
19255
2028
2129
2262
23511
2424
2511
26126
279
2860
291023
3026
312047
3216
3361
34254
3527
3620
374095
38510
39125
4056
418191
4258
4316383
44124
4525
461022
4732767
4848
4923
5022
51253
52252
5365535
5418
5559
56120
57509
582046
59131071

[0,1,3,2,7,6,15,4,5,14,31,12,63,30,13,8,127,10,
 255,28,29,62,511,24,11,126,9,60,1023,26,2047,16,
 61,254,27,20,4095,510,125,56,8191,58,16383,124,25,
 1022,32767,48,23,22,253,252,65535,18,59,120,509,
 2046,131071]