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A053507 as a simple table

na(n)
10
20
31
412
5150
62160
736015
8688128
914880348
10360000000
119646149645
12283787919360
139098660462034
14315866083233792
1511806916748046875
16472877960873902080
1720205339187128111480
18917543123840934346752
1944131536275846038655193

[0,0,1,12,150,2160,36015,688128,14880348,
 360000000,9646149645,283787919360,9098660462034,
 315866083233792,11806916748046875,
 472877960873902080,20205339187128111480,
 917543123840934346752,44131536275846038655193]