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A071720 as a simple table

na(n)
20
31
48
575
6864
712005
8196608
93720087
1080000000
111929229929
1251597803520
131516443410339
1448594782035968
151686702392578125
1663050394783186944
172525667398391013935
18107946249863639334912
194903504030649559850577
20235929600000000000000000

[0,1,8,75,864,12005,196608,3720087,80000000,
 1929229929,51597803520,1516443410339,
 48594782035968,1686702392578125,63050394783186944,
 2525667398391013935,107946249863639334912,
 4903504030649559850577,235929600000000000000000]