a(n) = 225*n^2 - n.

Terms

a(0) =224a(1) =898a(2) =2022a(3) =3596a(4) =5620a(5) =8094a(6) =11018a(7) =14392a(8) =18216a(9) =22490a(10) =27214a(11) =32388a(12) =38012a(13) =44086a(14) =50610a(15) =57584a(16) =65008a(17) =72882a(18) =81206a(19) =89980a(20) =99204a(21) =108878a(22) =119002a(23) =129576a(24) =140600a(25) =152074a(26) =163998a(27) =176372a(28) =189196a(29) =202470