a(n) = Product_{k<=n} A085818(k).

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =60a(5) =420a(6) =4620a(7) =9240a(8) =27720a(9) =360360a(10) =6126120a(11) =116396280a(12) =2677114440a(13) =77636318760