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A005990 as a simple table

na(n)
10
21
38
460
5480
64200
740320
8423360
94838400
1059875200
11798336000
1211416204800
13174356582400
142833294464000
1548819843072000
16889218570240000
1717072996548608000
18344661117825024000
197298706024529920000
20161787983543746560000

[0,1,8,60,480,4200,40320,423360,4838400,59875200,
 798336000,11416204800,174356582400,2833294464000,
 48819843072000,889218570240000,17072996548608000,
 344661117825024000,7298706024529920000,
 161787983543746560000]