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A167984 as a simple table

na(n)
30
40
5720
60
70
83600
92400
104320
1128800
1235400
1364800
14284400
15540000
161139400
173708000
188557200
1919677600
2055725120
21140359200
22346456800
23935942400
242442469200
256282571680

[0,0,720,0,0,3600,2400,4320,28800,35400,64800,
 284400,540000,1139400,3708000,8557200,19677600,
 55725120,140359200,346456800,935942400,2442469200,
 6282571680]