a(n) = n^3 * Sum_{d^2|n} 1 / d^3.

Terms

a(0) =1a(1) =8a(2) =27a(3) =72a(4) =125a(5) =216a(6) =343a(7) =576a(8) =756a(9) =1000a(10) =1331a(11) =1944a(12) =2197a(13) =2744a(14) =3375a(15) =4672a(16) =4913a(17) =6048a(18) =6859a(19) =9000a(20) =9261a(21) =10648a(22) =12167a(23) =15552a(24) =15750a(25) =17576a(26) =20412a(27) =24696a(28) =24389a(29) =27000