a(n) = 2^n mod 13.

Terms

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