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

Terms

a(0) =223a(1) =896a(2) =2019a(3) =3592a(4) =5615a(5) =8088a(6) =11011a(7) =14384a(8) =18207a(9) =22480a(10) =27203a(11) =32376a(12) =37999a(13) =44072a(14) =50595a(15) =57568a(16) =64991a(17) =72864a(18) =81187a(19) =89960a(20) =99183a(21) =108856a(22) =118979a(23) =129552a(24) =140575a(25) =152048a(26) =163971a(27) =176344a(28) =189167a(29) =202440