a(n) = Sum_{k=1..n} k * floor(n/k)^3.

Terms

a(0) =1a(1) =10a(2) =32a(3) =87a(4) =153a(5) =309a(6) =443a(7) =722a(8) =1005a(9) =1443a(10) =1785a(11) =2605a(12) =3087a(13) =3951a(14) =4875a(15) =6154a(16) =6988a(17) =8809a(18) =9855a(19) =12057a(20) =13853a(21) =16001a(22) =17543a(23) =21347a(24) =23478a(25) =26484a(26) =29440a(27) =33696a(28) =36162a(29) =41994