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A141520 as a simple table

na(n)
10
21
31
41
52
63
78
830
9264
108160
112162160
1217645379840
1338152152118080000
14673209215875134265982054400
1525684380411361480419900838705211915059200000

[0,1,1,1,2,3,8,30,264,8160,2162160,17645379840,
 38152152118080000,673209215875134265982054400,
 25684380411361480419900838705211915059200000]