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A353890 as a simple table

na(n)
21
31
45
511
691
71247
83485
9263017
10852841
111241058127
1274966255
13243641132605417
14181556731572385303
15718802057694183783881
166582662048285
17943422576750791493013356207217
18487331778345355477261
19607088607861933740557075591887834842297

[1,1,5,11,91,1247,3485,263017,852841,1241058127,
 74966255,243641132605417,181556731572385303,
 718802057694183783881,6582662048285,
 943422576750791493013356207217,
 487331778345355477261,
 607088607861933740557075591887834842297]