Period 2: repeat (4,7).

Terms

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