a(n) = n mod 3.

Terms

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