Period 2: repeat (6,9).

Terms

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