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A137666 as a simple table

na(n)
12
27
3311
4337
5266981089
629914249171
77563707819165039903
8192696104561
958769065453824529
10847499019384726257346113954958447091
1118158209813151
12138233050898929517126243814850350442620694127

[2,7,311,337,266981089,29914249171,
 7563707819165039903,192696104561,
 58769065453824529,
 847499019384726257346113954958447091,
 18158209813151,
 138233050898929517126243814850350442620694127]