a(n) = Product_{d|n, d<n} prime(A304101(d)-1).

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =2a(5) =8a(6) =2a(7) =12a(8) =4a(9) =8a(10) =2a(11) =120a(12) =2a(13) =12a(14) =8a(15) =24a(16) =2a(17) =200a(18) =2a(19) =120a(20) =12a(21) =12a(22) =2a(23) =1680a(24) =4a(25) =8a(26) =20a(27) =180a(28) =2a(29) =2000