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A215224 as a simple table

na(n)
15
220
360
4240
5720
62940
710080
838640
9140400
10529440
111956900
127335840
1327285180
14101960040
15380209980
161419732000

[5,20,60,240,720,2940,10080,38640,140400,529440,
 1956900,7335840,27285180,101960040,380209980,
 1419732000]