a(n) = Sum_{k=1..n} (k/gcd(n, k))^3.

Terms

a(0) =1a(1) =2a(2) =10a(3) =30a(4) =101a(5) =137a(6) =442a(7) =526a(8) =1063a(9) =1202a(10) =3026a(11) =1965a(12) =6085a(13) =4853a(14) =7310a(15) =8654a(16) =18497a(17) =10100a(18) =29242a(19) =17630a(20) =29557a(21) =30857a(22) =64010a(23) =30397a(24) =77601a(25) =60842a(26) =89272a(27) =71913a(28) =164837a(29) =60737