a(n) = 1225*n^2 + 35.

Terms

a(0) =35a(1) =1260a(2) =4935a(3) =11060a(4) =19635a(5) =30660a(6) =44135a(7) =60060a(8) =78435a(9) =99260a(10) =122535a(11) =148260a(12) =176435a(13) =207060a(14) =240135a(15) =275660a(16) =313635a(17) =354060a(18) =396935a(19) =442260a(20) =490035a(21) =540260a(22) =592935a(23) =648060a(24) =705635a(25) =765660a(26) =828135a(27) =893060a(28) =960435a(29) =1030260