a(n) = Product_{d|n, d<n} prime(1+A003415(d)), where A003415(d) gives arithmetic derivative of d.

Terms

a(0) =1a(1) =2a(2) =2a(3) =6a(4) =2a(5) =18a(6) =2a(7) =66a(8) =6a(9) =18a(10) =2a(11) =2574a(12) =2a(13) =18a(14) =18a(15) =2706a(16) =2a(17) =3978a(18) =2a(19) =3762a(20) =18a(21) =18a(22) =2a(23) =6226506a(24) =6a(25) =18a(26) =102a(27) =5742a(28) =2a(29) =306774