Period 2: repeat (4,9).

Terms

a(0) =4a(1) =9a(2) =4a(3) =9a(4) =4a(5) =9a(6) =4a(7) =9a(8) =4a(9) =9a(10) =4a(11) =9a(12) =4a(13) =9a(14) =4a(15) =9a(16) =4a(17) =9a(18) =4a(19) =9a(20) =4a(21) =9a(22) =4a(23) =9a(24) =4a(25) =9a(26) =4a(27) =9a(28) =4a(29) =9