a(n) = product of divisors of n that are not perfect powers.

Terms

a(0) =1a(1) =2a(2) =3a(3) =2a(4) =5a(5) =36a(6) =7a(7) =2a(8) =3a(9) =100a(10) =11a(11) =432a(12) =13a(13) =196a(14) =225a(15) =2a(16) =17a(17) =648a(18) =19a(19) =2000a(20) =441a(21) =484a(22) =23a(23) =10368a(24) =5a(25) =676a(26) =3a(27) =5488a(28) =29a(29) =810000