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A181441 as a simple table

na(n)
11
27
341
4331
53001
642043
7919913
819734581
9440817757
1012501968177
11435748987787
1219638537755027
13692919372869953
1430634679101122821
151695313841631390713

[1,7,41,331,3001,42043,919913,19734581,440817757,
 12501968177,435748987787,19638537755027,
 692919372869953,30634679101122821,
 1695313841631390713]