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A215230 as a simple table

na(n)
10
20
3840
410080
557960
6228480
7710640
81874880
94379760
109313920
1118378360
1234114080
1360180120
14101687040
15165590880
16261152640
17400468320
18599074560
19876634920
201257711840
211772629320
222458431360
233359941200
244530926400

[0,0,840,10080,57960,228480,710640,1874880,
 4379760,9313920,18378360,34114080,60180120,
 101687040,165590880,261152640,400468320,599074560,
 876634920,1257711840,1772629320,2458431360,
 3359941200,4530926400]