a(n) = n^2*sigma_4(n).

Terms

a(0) =0a(1) =1a(2) =68a(3) =738a(4) =4368a(5) =15650a(6) =50184a(7) =117698a(8) =279616a(9) =538083a(10) =1064200a(11) =1771682a(12) =3223584a(13) =4826978a(14) =8003464a(15) =11549700a(16) =17895680a(17) =24137858a(18) =36589644a(19) =47046242a(20) =68359200a(21) =86861124a(22) =120474376a(23) =148036418a(24) =206356608a(25) =244531875a(26) =328234504a(27) =392263236a(28) =514104864a(29) =594824162