a(n) = 29*n^2.

Terms

a(0) =0a(1) =29a(2) =116a(3) =261a(4) =464a(5) =725a(6) =1044a(7) =1421a(8) =1856a(9) =2349a(10) =2900a(11) =3509a(12) =4176a(13) =4901a(14) =5684a(15) =6525a(16) =7424a(17) =8381a(18) =9396a(19) =10469a(20) =11600a(21) =12789a(22) =14036a(23) =15341a(24) =16704a(25) =18125a(26) =19604a(27) =21141a(28) =22736a(29) =24389