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A064560 as a simple table

na(n)
19
2576
336864
4140625
52359296
6150994944
72197265625
89663676416
9618475290624
1034332275390625
1139582418599936
122533274790395904
13162129586585337856
14536441802978515625
1510376293541461622784
16664082786653543858176

[9,576,36864,140625,2359296,150994944,2197265625,
 9663676416,618475290624,34332275390625,
 39582418599936,2533274790395904,
 162129586585337856,536441802978515625,
 10376293541461622784,664082786653543858176]