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A158940 as a simple table

na(n)
12
27
331
41637
51831
674653
7322171
85051309
911938793
10245333213
11245333159
12130272314561
131273135176799
1423840790158827

[2,7,31,1637,1831,74653,322171,5051309,11938793,
 245333213,245333159,130272314561,1273135176799,
 23840790158827]