a(n) = n^3 - 2*n^2 - 1.

Terms

a(0) =-2a(1) =-1a(2) =8a(3) =31a(4) =74a(5) =143a(6) =244a(7) =383a(8) =566a(9) =799a(10) =1088a(11) =1439a(12) =1858a(13) =2351a(14) =2924a(15) =3583a(16) =4334a(17) =5183a(18) =6136a(19) =7199a(20) =8378a(21) =9679a(22) =11108a(23) =12671a(24) =14374a(25) =16223a(26) =18224a(27) =20383a(28) =22706a(29) =25199