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A065061 as a simple table

na(n)
13
28
3162
4512
51250
68192
731250
832768
941472
10663552
112531250
123748322
135120000
146837602
157558272
168000000
1715780962
1833554432
1935701250
2042762752
2145334242
2268024448
2375031250
2478125000
2591125000
26137149922
27243101250
28512000000
29907039232
30959570432

[3,8,162,512,1250,8192,31250,32768,41472,663552,
 2531250,3748322,5120000,6837602,7558272,8000000,
 15780962,33554432,35701250,42762752,45334242,
 68024448,75031250,78125000,91125000,137149922,
 243101250,512000000,907039232,959570432]