This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A007884 #12 Jun 16 2023 17:21:43
%S A007884 1,2,3,1,1,2,3,2,1,2,3,3,1,2,3,4,1,2,3,5,1,2,3,6,1,2,3,7,1,2,3,8,1,2,
%T A007884 3,9,1,2,3,10,1,2,3,11,1,2,3,12,1,2,3,1,1,2,3,2,1,2,3,3,1,2,3,4,1,2,3,
%U A007884 5,1,2,3,6,1,2,3,7,1,2,3,8,1,2,3,9,1,2,3,10,1,2,3,11,1,2,3,12
%N A007884 Chimes made by clock striking quarter-hours.
%C A007884 Periodic sequence with period 48. - _Michel Marcus_, Jul 17 2013
%t A007884 Table[Flatten[Table[PadRight[{1,2,3},4,h],{h,12}]],{2}]//Flatten (* _Harvey P. Dale_, Jun 16 2023 *)
%o A007884 (PARI) a(n)= if((n+1)%4, (n+1)%4, ((n+1)/4-1)%12+1) \\ _Michel Marcus_, Jul 17 2013
%Y A007884 Cf. A001492, A007879, A007880, A007883.
%K A007884 nonn
%O A007884 0,2
%A A007884 _Colin Mallows_