a(n) = 30*n^2.

Terms

a(0) =0a(1) =30a(2) =120a(3) =270a(4) =480a(5) =750a(6) =1080a(7) =1470a(8) =1920a(9) =2430a(10) =3000a(11) =3630a(12) =4320a(13) =5070a(14) =5880a(15) =6750a(16) =7680a(17) =8670a(18) =9720a(19) =10830a(20) =12000a(21) =13230a(22) =14520a(23) =15870a(24) =17280a(25) =18750a(26) =20280a(27) =21870a(28) =23520a(29) =25230