a(n) = 60*n^2 + 180*n + 150.

Terms

a(0) =390a(1) =750a(2) =1230a(3) =1830a(4) =2550a(5) =3390a(6) =4350a(7) =5430a(8) =6630a(9) =7950a(10) =9390a(11) =10950a(12) =12630a(13) =14430a(14) =16350a(15) =18390a(16) =20550a(17) =22830a(18) =25230a(19) =27750a(20) =30390a(21) =33150a(22) =36030a(23) =39030a(24) =42150a(25) =45390a(26) =48750a(27) =52230a(28) =55830a(29) =59550