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A280078 as a simple table

na(n)
11
24
320
4220
51540
630800
7277200
87207200
9129729600
103632428800
1147221574400
122597186592000
1338957798880000
141402480759680000
1549086826588800000
162797949115561600000
1753161033195670400000
183827594390088268800000
1980379482191853644800000

[1,4,20,220,1540,30800,277200,7207200,129729600,
 3632428800,47221574400,2597186592000,
 38957798880000,1402480759680000,49086826588800000,
 2797949115561600000,53161033195670400000,
 3827594390088268800000,80379482191853644800000]