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A218242 as a simple table

na(n)
11
23
33
47
515
67
715
863
963
1015
1129
12255
13511
14255
1529
1657
171017
184095
194095
201017
2157
22113
234065
2432753
2565535
2632753
274065
28113
29225
3016257
31262017
321048545
331048545
34262017
3516257
36225
37449
3865025
392096129
4016776705
4133552513
4216776705
432096129

[1,3,3,7,15,7,15,63,63,15,29,255,511,255,29,57,
 1017,4095,4095,1017,57,113,4065,32753,65535,32753,
 4065,113,225,16257,262017,1048545,1048545,262017,
 16257,225,449,65025,2096129,16776705,33552513,
 16776705,2096129]