a(1) = 1; for n > 1, a(n) = Product_{d|n} A019565(d)^[moebius(d) = +1].

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =2a(5) =30a(6) =2a(7) =2a(8) =2a(9) =42a(10) =2a(11) =30a(12) =2a(13) =210a(14) =420a(15) =2a(16) =2a(17) =30a(18) =2a(19) =42a(20) =220a(21) =330a(22) =2a(23) =30a(24) =2a(25) =462a(26) =2a(27) =210a(28) =2a(29) =132300