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A269386 as a simple table

na(n)
10
21
33
42
57
66
715
84
95
1014
1131
1212
1363
1430
1513
168
17127
1810
1911
2028
219
2262
23255
2424
25511
26126
2729
2860
291023
3026
3123
3216
3325
34254
3527
3620
372047
3822
3961
4056
414095
4218
438191
44124
4517
46510
4716383
4848
4919
501022
5121
52252
5332767
5458
5547
56120
5757
582046
5955
6052
6165535
6246
63125
6432
6559
6650
67131071
68508
6949
7054
71262143
7240
7395
744094
75253
7644

[0,1,3,2,7,6,15,4,5,14,31,12,63,30,13,8,127,10,11,
 28,9,62,255,24,511,126,29,60,1023,26,23,16,25,254,
 27,20,2047,22,61,56,4095,18,8191,124,17,510,16383,
 48,19,1022,21,252,32767,58,47,120,57,2046,55,52,
 65535,46,125,32,59,50,131071,508,49,54,262143,40,
 95,4094,253,44]