a(n) = Product_{d|n} A019565(d)^[moebius(n/d) = +1].

Terms

a(0) =2a(1) =3a(2) =6a(3) =5a(4) =10a(5) =30a(6) =30a(7) =7a(8) =14a(9) =42a(10) =42a(11) =105a(12) =70a(13) =210a(14) =420a(15) =11a(16) =22a(17) =198a(18) =66a(19) =165a(20) =220a(21) =330a(22) =330a(23) =385a(24) =154a(25) =462a(26) =462a(27) =1155a(28) =770a(29) =207900