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A290422 as a simple table

na(n)
01
11
23
31
47
51
615
77
831
93
1063
1125
12127
131
14255
15127
16511
1763
181023
19415
202047
2115
224095
232023
248191
25963
2616383
276553
2832767
291
3065535
3132767
32131071
3316383
34262143
35106495
36524287
374095
381048575
39518143
402097151
41246783
424194303
431677823
448388607
45255

[1,1,3,1,7,1,15,7,31,3,63,25,127,1,255,127,511,63,
 1023,415,2047,15,4095,2023,8191,963,16383,6553,
 32767,1,65535,32767,131071,16383,262143,106495,
 524287,4095,1048575,518143,2097151,246783,4194303,
 1677823,8388607,255]