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A323966 as a simple table

na(n)
100
1119200
12947760
1349680576
141744142400
1560169824000
161646888944800
1742633973724160
181013373907056960
1922797317814635520
20502986050203680000
2110556482426015426560
22222685725334400064000
234535040919258899456000
2492995172484979478630400
251880492299058130490163200

[0,19200,947760,49680576,1744142400,60169824000,
 1646888944800,42633973724160,1013373907056960,
 22797317814635520,502986050203680000,
 10556482426015426560,222685725334400064000,
 4535040919258899456000,92995172484979478630400,
 1880492299058130490163200]