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A159370 as a simple table

na(n)
520
664440
720417688
83553639544
9136157771160
102292617515072
1123218711066200
12166097016796752
13921709788123744
144211771972031320
1516503648565063896
1657078845541052008
17177996206009045096
18508664826181945152

[20,64440,20417688,3553639544,136157771160,
 2292617515072,23218711066200,166097016796752,
 921709788123744,4211771972031320,
 16503648565063896,57078845541052008,
 177996206009045096,508664826181945152]