Period 2: repeat [4,5].

Terms

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