Period 2: repeat (6,7).

Terms

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