Period 2: repeat (2,10).

Terms

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