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A162868 as a simple table

na(n)
01
12
240
34680
41591200
51891936800
64270101357600
711089453225687200
832565776278494961756800
928429922691126101613686400
1042204464874461454985621846571472000

[1,2,40,4680,1591200,1891936800,4270101357600,
 11089453225687200,32565776278494961756800,
 28429922691126101613686400,
 42204464874461454985621846571472000]