a(n) = floor(average of first n cubes).

Terms

a(0) =1a(1) =4a(2) =12a(3) =25a(4) =45a(5) =73a(6) =112a(7) =162a(8) =225a(9) =302a(10) =396a(11) =507a(12) =637a(13) =787a(14) =960a(15) =1156a(16) =1377a(17) =1624a(18) =1900a(19) =2205a(20) =2541a(21) =2909a(22) =3312a(23) =3750a(24) =4225a(25) =4738a(26) =5292a(27) =5887a(28) =6525a(29) =7207