Simple periodic sequence underlying clock sequence A028354.

Terms

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