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A038728 as a simple table

na(n)
10
20
30
40
52240
635840
7433040
84862560
951759280
10527313040
115218528800
1250434399280
13478624474160
144473452644480

[0,0,0,0,2240,35840,433040,4862560,51759280,
 527313040,5218528800,50434399280,478624474160,
 4473452644480]