Sum of cubes of unitary divisors of n.

Terms

a(0) =1a(1) =9a(2) =28a(3) =65a(4) =126a(5) =252a(6) =344a(7) =513a(8) =730a(9) =1134a(10) =1332a(11) =1820a(12) =2198a(13) =3096a(14) =3528a(15) =4097a(16) =4914a(17) =6570a(18) =6860a(19) =8190a(20) =9632a(21) =11988a(22) =12168a(23) =14364a(24) =15626a(25) =19782a(26) =19684a(27) =22360a(28) =24390a(29) =31752