a(1) = 1, a(n+1)= a(n)*(n+1) divided by the smallest prime divisor of n+1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =6a(6) =6a(7) =24a(8) =72a(9) =360a(10) =360a(11) =2160a(12) =2160a(13) =15120a(14) =75600a(15) =604800a(16) =604800a(17) =5443200a(18) =5443200a(19) =54432000a(20) =381024000a(21) =4191264000a(22) =4191264000a(23) =50295168000a(24) =251475840000