a(n) = Sum_{d|n} n^rad(d).

Terms

a(0) =1a(1) =6a(2) =30a(3) =36a(4) =3130a(5) =46914a(6) =823550a(7) =200a(8) =1467a(9) =10000100110a(10) =285311670622a(11) =5973996a(15) =1040a(17) =68036454