Repeat (1,6): Period 2.

Terms

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