a(n+1) = A001610(n)*a(n).A196870a(n+1) = A001610(n)*a(n).Terms a(0) =1a(1) =2a(2) =6a(3) =36a(4) =360a(5) =6120a(6) =171360a(7) =7882560a(8) =591192000a(9) =72125424000External referencesoeis: A196870