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 A156263 #4 Jun 02 2025 01:21:16 %S A156263 2,1,2,2,1,1,1,1,2,1,1,2,2,1,2,2,2,2,2,1,2,2,1,1,2,2,2,2,1,2,2,1,1,1, %T A156263 1,2,2,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,2,2,2, %U A156263 2,1,2,2,1,1,2,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,2,2,1,2,2,2,2,2,2,2,2,1,2 %N A156263 a(n)=A000002(3*n-1). %Y A156263 Cf. A074264 %K A156263 nonn %O A156263 1,1 %A A156263 _Benoit Cloitre_, Feb 07 2009