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A181616 as a simple table

na(n)
15
229
311
4127
523
6541
747
82213
997
109413
11193
1237253
13389
14151337
15787
16619373
171579
182493259
193163
2010004573
216329
2240056253
2312659
24160250297
2525321
26641153069
2750647
282565118639
29101293
3010260271859
31202591
3241043113401
33405199

[5,29,11,127,23,541,47,2213,97,9413,193,37253,389,
 151337,787,619373,1579,2493259,3163,10004573,6329,
 40056253,12659,160250297,25321,641153069,50647,
 2565118639,101293,10260271859,202591,41043113401,
 405199]