a(n) = 50*n^2 + 1.

Terms

a(0) =51a(1) =201a(2) =451a(3) =801a(4) =1251a(5) =1801a(6) =2451a(7) =3201a(8) =4051a(9) =5001a(10) =6051a(11) =7201a(12) =8451a(13) =9801a(14) =11251a(15) =12801a(16) =14451a(17) =16201a(18) =18051a(19) =20001a(20) =22051a(21) =24201a(22) =26451a(23) =28801a(24) =31251a(25) =33801a(26) =36451a(27) =39201a(28) =42051a(29) =45001