a(n) = Product_{d|n, d<n} A019565(d)^[1 == d mod 3].

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =2a(5) =2a(6) =2a(7) =10a(8) =2a(9) =2a(10) =2a(11) =10a(12) =2a(13) =60a(14) =2a(15) =10a(16) =2a(17) =2a(18) =2a(19) =210a(20) =60a(21) =2a(22) =2a(23) =10a(24) =2a(25) =140a(26) =2a(27) =300a(28) =2a(29) =42