Ternary Thue-Morse sequence: closed under a->abc, b->ac, c->b.

Terms

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