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 A156352 #4 Jun 02 2025 01:22:04
%S A156352 1,1,3,2,1,2,1,1,2,1,1,3,2,1,3,2,1,1,2,1,3,2,1,2,1,1,3,2,1,3,2,1,2,1,
%T A156352 1,2,1,1,3,2,1,2,1,1,2,1,3,2,1,3,2,1,1,2,1,1,3,2,1,2,1,1,2,1,1,3,2,1,
%U A156352 3,2,1,2,1,1,2,1,3,2,1,1,2,1,1,3,2,1,2,1,1,2,1,1,3,2,1,3,2,1,1,2,1,3,2,1,2
%N A156352 a(n)=A078649(A054353(n)-n+1)-A054353(n).
%F A156352 a(n)=3 iff {A000002(n),A000002(n+1),A000002(n+2)}={2,1,1}
%K A156352 nonn
%O A156352 1,3
%A A156352 _Benoit Cloitre_, Feb 08 2009