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A006406 as a simple table

na(n)
31
41
52
64
79
824
981
10274
111071
124357
1318416
1480040
15356109
161610910
177399114

[1,1,2,4,9,24,81,274,1071,4357,18416,80040,356109,
 1610910,7399114]