a(n) = n*phi(n)^2, phi = A000010.

Terms

a(0) =1a(1) =2a(2) =12a(3) =16a(4) =80a(5) =24a(6) =252a(7) =128a(8) =324a(9) =160a(10) =1100a(11) =192a(12) =1872a(13) =504a(14) =960a(15) =1024a(16) =4352a(17) =648a(18) =6156a(19) =1280a(20) =3024a(21) =2200a(22) =11132a(23) =1536a(24) =10000a(25) =3744a(26) =8748a(27) =4032a(28) =22736a(29) =1920