Period 2: repeat (1,4).

Terms

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