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A075169 as a simple table

na(n)
00
11
22
33
45
54
66
77
815
910
1011
119
128
1316
1413
1512
1614
1763
1831
1930
20127
21255
2265535
2321
2420
2522
2623
2747
2818
2919
3017
3164
3232
3333
34128
35256
3665536
3726
3827
3925
4024
4148
4229
4328
44126
452047
464095
4762
481023
49511
50131071
5161
5260
53254
5416383
558191
56510
5732767

[0,1,2,3,5,4,6,7,15,10,11,9,8,16,13,12,14,63,31,
 30,127,255,65535,21,20,22,23,47,18,19,17,64,32,33,
 128,256,65536,26,27,25,24,48,29,28,126,2047,4095,
 62,1023,511,131071,61,60,254,16383,8191,510,32767]