a(1) = 1; for n > 1, a(n) = smallest number > a(n-1) having exactly n divisors.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =16a(5) =18a(6) =64a(7) =66a(8) =100a(9) =112a(10) =1024a(11) =1035a(12) =4096a(13) =4288a(14) =4624a(15) =4632a(16) =65536a(17) =65572a(18) =262144a(19) =262192a(20) =263169a(21) =269312a(22) =4194304a(23) =4194306a(24) =4477456a(25) =4493312a(26) =4498641a(27) =4498752a(28) =268435456a(29) =268437200