a(n) = n*(n-1)*(n-2)*(n-3)*...*(n-k) such that (n-k) is the largest prime smaller than n.

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =60a(5) =30a(6) =210a(7) =56a(8) =504a(9) =5040a(10) =55440a(11) =132a(12) =1716a(13) =182a(14) =2730a(15) =43680a(16) =742560a(17) =306a(18) =5814a(19) =380a(20) =7980a(21) =175560a(22) =4037880a(23) =552a(24) =13800a(25) =358800a(26) =9687600a(27) =271252800a(28) =7866331200a(29) =870