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

Terms

a(0) =1a(1) =12a(2) =51a(3) =134a(4) =281a(5) =508a(6) =835a(7) =1278a(8) =1857a(9) =2588a(10) =3491a(11) =4582a(12) =5881a(13) =7404a(14) =9171a(15) =11198a(16) =13505a(17) =16108a(18) =19027a(19) =22278a(20) =25881a(21) =29852a(22) =34211a(23) =38974a(24) =44161a(25) =49788a(26) =55875a(27) =62438a(28) =69497a(29) =77068