a(n) = 22*n^2.

Terms

a(0) =0a(1) =22a(2) =88a(3) =198a(4) =352a(5) =550a(6) =792a(7) =1078a(8) =1408a(9) =1782a(10) =2200a(11) =2662a(12) =3168a(13) =3718a(14) =4312a(15) =4950a(16) =5632a(17) =6358a(18) =7128a(19) =7942a(20) =8800a(21) =9702a(22) =10648a(23) =11638a(24) =12672a(25) =13750a(26) =14872a(27) =16038a(28) =17248a(29) =18502