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A090520 as a simple table

na(n)
15
27
343
4769
51123
652631
71428571
82127659
914925373
10769230769
115882352941
126369426751
13588235294117
14319488817891
159345794392523
1624449877750611
17662251655629139
181293661060802069
1967114093959731543
20244498777506112469

[5,7,43,769,1123,52631,1428571,2127659,14925373,
 769230769,5882352941,6369426751,588235294117,
 319488817891,9345794392523,24449877750611,
 662251655629139,1293661060802069,
 67114093959731543,244498777506112469]