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A064703 as a simple table

na(n)
13
29
363
4189
5729
6729
72187
835721
945927
10413343
11413343
122657205
133720087
144782969
1533480783
16100442349
17387420489
18387420489
191162261467

[3,9,63,189,729,729,2187,35721,45927,413343,
 413343,2657205,3720087,4782969,33480783,100442349,
 387420489,387420489,1162261467]