a(n) is the smallest number with n refactorable divisors.

Terms

a(0) =1a(1) =2a(2) =8a(3) =18a(4) =24a(5) =36a(6) =108a(7) =180a(8) =72a(9) =216a(10) =288a(11) =1944a(12) =360a(13) =1080a(14) =1920a(15) =720a(16) =1800a(17) =2160a(18) =5400a(19) =1440a(20) =6720a(21) =3600a(22) =12600a(23) =4320a(24) =16200a(25) =5760a(26) =12960a(27) =38016a(28) =13440a(29) =45360