Simple periodic sequence: n mod 12.

Terms

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