Period 2: repeat (2,7).

Terms

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