a(n) = 81*n^2 - 118*n + 43.

Terms

a(0) =43a(1) =6a(2) =131a(3) =418a(4) =867a(5) =1478a(6) =2251a(7) =3186a(8) =4283a(9) =5542a(10) =6963a(11) =8546a(12) =10291a(13) =12198a(14) =14267a(15) =16498a(16) =18891a(17) =21446a(18) =24163a(19) =27042a(20) =30083a(21) =33286a(22) =36651a(23) =40178a(24) =43867a(25) =47718a(26) =51731a(27) =55906a(28) =60243a(29) =64742