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A066880 as a simple table

na(n)
12
23
36
47
514
615
730
831
962
1063
11126
12127
13254
14255
15510
16511
171022
181023
192046
202047
214094
224095
238190
248191
2516382
2616383
2732766
2832767
2965534
3065535
31131070
32131071
33262142
34262143
35524286
36524287
371048574
381048575
392097150
402097151
414194302
424194303

[2,3,6,7,14,15,30,31,62,63,126,127,254,255,510,
 511,1022,1023,2046,2047,4094,4095,8190,8191,16382,
 16383,32766,32767,65534,65535,131070,131071,
 262142,262143,524286,524287,1048574,1048575,
 2097150,2097151,4194302,4194303]