a(n) = Sum_{d|n} (n-d)^tau(n/d).

Terms

a(0) =0a(1) =1a(2) =4a(3) =31a(4) =16a(5) =650a(6) =36a(7) =2633a(8) =548a(9) =6650a(10) =100a(11) =1782390a(12) =144a(13) =28754a(14) =38660a(15) =799583a(16) =256a(17) =24192515a(18) =324a(19) =47154588a(20) =160520a(21) =195002a(22) =484a(23) =78424725898a(24) =14224a(25) =391370a(26) =471124a(27) =387887498a(28) =784a(29) =500247950884