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A056582 as a simple table

na(n)
21
31
44
51
61728
71
865536
919683
103200000
111
128916100448256
131
1413492928512
15437893890380859375
1618446744073709551616
171
1839346408075296537575424
191
20104857600000000000000000000

[1,1,4,1,1728,1,65536,19683,3200000,1,
 8916100448256,1,13492928512,437893890380859375,
 18446744073709551616,1,39346408075296537575424,1,
 104857600000000000000000000]