a(n) = n + (n+1)^2 + (n+2)^3.

Terms

a(0) =9a(1) =32a(2) =75a(3) =144a(4) =245a(5) =384a(6) =567a(7) =800a(8) =1089a(9) =1440a(10) =1859a(11) =2352a(12) =2925a(13) =3584a(14) =4335a(15) =5184a(16) =6137a(17) =7200a(18) =8379a(19) =9680a(20) =11109a(21) =12672a(22) =14375a(23) =16224a(24) =18225a(25) =20384a(26) =22707a(27) =25200a(28) =27869a(29) =30720