Floor((n+1/n)^3).

Terms

a(0) =8a(1) =15a(2) =37a(3) =76a(4) =140a(5) =234a(6) =364a(7) =536a(8) =756a(9) =1030a(10) =1364a(11) =1764a(12) =2236a(13) =2786a(14) =3420a(15) =4144a(16) =4964a(17) =5886a(18) =6916a(19) =8060a(20) =9324a(21) =10714a(22) =12236a(23) =13896a(24) =15700a(25) =17654a(26) =19764a(27) =22036a(28) =24476a(29) =27090