a(n) = Sum_{d|n} max(d, n/d)^4.

Terms

a(0) =1a(1) =32a(2) =162a(3) =528a(4) =1250a(5) =2754a(6) =4802a(7) =8704a(8) =13203a(9) =21250a(10) =29282a(11) =44576a(12) =57122a(13) =81634a(14) =102500a(15) =139520a(16) =167042a(17) =225666a(18) =260642a(19) =341250a(20) =393764a(21) =497794a(22) =559682a(23) =715808a(24) =781875a(25) =971074a(26) =1076004a(27) =1310946a(28) =1414562a(29) =1743842