a(n) = 81*n^2 - 90*n + 26.

Terms

a(0) =26a(1) =17a(2) =170a(3) =485a(4) =962a(5) =1601a(6) =2402a(7) =3365a(8) =4490a(9) =5777a(10) =7226a(11) =8837a(12) =10610a(13) =12545a(14) =14642a(15) =16901a(16) =19322a(17) =21905a(18) =24650a(19) =27557a(20) =30626a(21) =33857a(22) =37250a(23) =40805a(24) =44522a(25) =48401a(26) =52442a(27) =56645a(28) =61010a(29) =65537