a(n) = 2*n^4 - floor(2^(1/4)*n)^4.

Terms

a(0) =0a(1) =1a(2) =16a(3) =81a(4) =256a(5) =625a(6) =191a(7) =706a(8) =1631a(9) =3122a(10) =5359a(11) =721a(12) =3056a(13) =6497a(14) =11296a(15) =17729a(16) =751a(17) =7042a(18) =15471a(19) =26386a(20) =40159a(21) =57186a(22) =11536a(23) =28241a(24) =48896a(25) =73969a(26) =103952a(27) =14306a(28) =43391a(29) =78226