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A160275 as a simple table

na(n)
11
25
315
415
530
6210
71050
86300
91045800
1013756453200
1167826316310678800
128622353329220210792550912000
1392206830102396929163916671718833533307592704000

[1,5,15,15,30,210,1050,6300,1045800,13756453200,
 67826316310678800,8622353329220210792550912000,
 92206830102396929163916671718833533307592704000]