a(n) = Sum_{d|n} max(d, n/d)^3.

Terms

a(0) =1a(1) =16a(2) =54a(3) =136a(4) =250a(5) =486a(6) =686a(7) =1152a(8) =1485a(9) =2250a(10) =2662a(11) =4016a(12) =4394a(13) =6174a(14) =7000a(15) =9280a(16) =9826a(17) =13554a(18) =13718a(19) =18250a(20) =19208a(21) =23958a(22) =24334a(23) =32560a(24) =31375a(25) =39546a(26) =40824a(27) =50078a(28) =48778a(29) =63182