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A046981 as a simple table

na(n)
01
11
21
33
46
530
61
7630
82520
922680
101
111247400
127484400
1397297200
141
1510216206000
1681729648000
171389404016000
181
19237588086736000
202375880867360000
2149893498214560000
221
2312623055048283680000
24151476660579404160000
253786916514485104000000

[1,1,1,3,6,30,1,630,2520,22680,1,1247400,7484400,
 97297200,1,10216206000,81729648000,1389404016000,
 1,237588086736000,2375880867360000,
 49893498214560000,1,12623055048283680000,
 151476660579404160000,3786916514485104000000]