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A293447 as a simple table

na(n)
10
21
33
42
57
64
715
83
96
108
1131
125
1363
1416
1510
164
17127
187
19255
209
2118
2232
23511
246
2514
2664
279
2817
291023
3011
312047
325
3334
34128
3522
368
374095
38256
3966
4010
418191
4219
4316383
4433
4513
46512
4732767
487
4930
5015
51130
5265
5365535
5410
5538
5618
57258
581024
59131071
6012
61262143
622048
6321
646
6570
6635
67524287
68129
69514
7023
711048575
729
732097151
744096
7517
76257
7746
7867
794194303
8011
8112

[0,1,3,2,7,4,15,3,6,8,31,5,63,16,10,4,127,7,255,9,
 18,32,511,6,14,64,9,17,1023,11,2047,5,34,128,22,8,
 4095,256,66,10,8191,19,16383,33,13,512,32767,7,30,
 15,130,65,65535,10,38,18,258,1024,131071,12,
 262143,2048,21,6,70,35,524287,129,514,23,1048575,
 9,2097151,4096,17,257,46,67,4194303,11,12]