a(n) = Product_{d|n} (pod(d)/d) where pod(k) is the product of the divisors of k (A007955).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =6a(6) =1a(7) =16a(8) =3a(9) =10a(10) =1a(11) =1728a(12) =1a(13) =14a(14) =15a(15) =1024a(16) =1a(17) =5832a(18) =1a(19) =8000a(20) =21a(21) =22a(22) =1a(23) =191102976a(24) =5a(25) =26a(26) =81a(27) =21952a(28) =1a(29) =24300000