A nonrepetitive sequence.

Terms

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