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A078190 as a simple table

na(n)
15
223
311
471
5503
662270207
7871782911
8121645100408831
9243290200817663
10304888344611713860501503
11137637530912263450463159795815809023

[5,23,11,71,503,62270207,871782911,
 121645100408831,243290200817663,
 304888344611713860501503,
 137637530912263450463159795815809023]