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A171721 as a simple table

na(n)
11
21
33
42
53
67
717
817
97
1015
11116
12122
13116
1415
1531
16627
171262
181262
19627
2031
2163
222990
2312433
2415108
2512433
262990
2763
28127
2913309
30107151
31201973
32201973
33107151
3413309
35127
36255
3756936
38830628
392612184
403321914
412612184
42830628
4356936
44255
45511

[1,1,3,2,3,7,17,17,7,15,116,122,116,15,31,627,
 1262,1262,627,31,63,2990,12433,15108,12433,2990,
 63,127,13309,107151,201973,201973,107151,13309,
 127,255,56936,830628,2612184,3321914,2612184,
 830628,56936,255,511]