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A264146 as a simple table

na(n)
164
29261
31440000
4117534144
512968882161
61376159333484
7147813083354689
815629429778886656
91668183383627274240
10177524398873895731200
1118903690233550713749504

[64,9261,1440000,117534144,12968882161,
 1376159333484,147813083354689,15629429778886656,
 1668183383627274240,177524398873895731200,
 18903690233550713749504]