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A317487 as a simple table

na(n)
10
20
30
46
590
61080
712600
8151200
91905120
1025401600
11359251200
125388768000
1385621536000
141438441804800
1525499650176000
16475993469952000
179336794987520000
18192071211171840000
194135933413900288000
2093058501812756480000
212184137777840578560000
2253390034569436364800000

[0,0,0,6,90,1080,12600,151200,1905120,25401600,
 359251200,5388768000,85621536000,1438441804800,
 25499650176000,475993469952000,9336794987520000,
 192071211171840000,4135933413900288000,
 93058501812756480000,2184137777840578560000,
 53390034569436364800000]