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A173491 as a simple table

na(n)
13
227
3101
4239
521649
619
73191
835121409
9722817036322379041
102241
11797
12967
131230610745978027
143373
1560787
16509538919
1715060275578609
185779
1937397
20423557

[3,27,101,239,21649,19,3191,35121409,
 722817036322379041,2241,797,967,1230610745978027,
 3373,60787,509538919,15060275578609,5779,37397,
 423557]