a(n) = 1250*n^2 - 700*n + 99.

Terms

a(0) =99a(1) =649a(2) =3699a(3) =9249a(4) =17299a(5) =27849a(6) =40899a(7) =56449a(8) =74499a(9) =95049a(10) =118099a(11) =143649a(12) =171699a(13) =202249a(14) =235299a(15) =270849a(16) =308899a(17) =349449a(18) =392499a(19) =438049a(20) =486099a(21) =536649a(22) =589699a(23) =645249a(24) =703299a(25) =763849a(26) =826899a(27) =892449a(28) =960499a(29) =1031049