a(n) = 225*n^2 - 15.

Terms

a(0) =210a(1) =885a(2) =2010a(3) =3585a(4) =5610a(5) =8085a(6) =11010a(7) =14385a(8) =18210a(9) =22485a(10) =27210a(11) =32385a(12) =38010a(13) =44085a(14) =50610a(15) =57585a(16) =65010a(17) =72885a(18) =81210a(19) =89985a(20) =99210a(21) =108885a(22) =119010a(23) =129585a(24) =140610a(25) =152085a(26) =164010a(27) =176385a(28) =189210a(29) =202485