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

Terms

a(0) =1a(1) =4a(2) =18a(3) =32a(4) =100a(5) =72a(6) =294a(7) =256a(8) =486a(9) =400a(10) =1210a(11) =576a(12) =2028a(13) =1176a(14) =1800a(15) =2048a(16) =4624a(17) =1944a(18) =6498a(19) =3200a(20) =5292a(21) =4840a(22) =11638a(23) =4608a(24) =12500a(25) =8112a(26) =13122a(27) =9408a(28) =23548a(29) =7200