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A088554 as a simple table

na(n)
12
27
331
4157
53907
619531
72441407
812207031
961035157
10305175781
119313225746154785157
12177635683940025046467781066894531

[2,7,31,157,3907,19531,2441407,12207031,61035157,
 305175781,9313225746154785157,
 177635683940025046467781066894531]