a(n) = Sum_{d|n} max(d, n/d)^5.

Terms

a(0) =1a(1) =64a(2) =486a(3) =2080a(4) =6250a(5) =16038a(6) =33614a(7) =67584a(8) =118341a(9) =206250a(10) =322102a(11) =515264a(12) =742586a(13) =1109262a(14) =1525000a(15) =2163712a(16) =2839714a(17) =3912786a(18) =4952198a(19) =6606250a(20) =8201816a(21) =10629366a(22) =12872686a(23) =16504000a(24) =19534375a(25) =24505338a(26) =28815912a(27) =35529998a(28) =41022298a(29) =50334302