a(n) = Product_{k=1..n} k^(floor(n/k)^2).A345726a(n) = Product_{k=1..n} k^(floor(n/k)^2).Terms a(0) =1a(1) =2a(2) =6a(3) =192a(4) =960a(5) =4976640a(6) =34836480External referencesoeis: A345726