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 A156267 #4 Jun 02 2025 01:21:29 %S A156267 1,2,1,1,2,3,3,2,1,2,2,1,1,2,1,-1,-1,1,1,2,1,1,2,2,1,-1,1,1,2,1,1,2,3, %T A156267 3,2,1,1,2,2,1,2,3,3,2,3,4,4,5,3,3,4,3,2,3,4,4,5,3,2,3,3,2,1,2,2,1,-1, %U A156267 1,1,2,1,1,2,2,1,2,3,4,3,2,1,2,3,3,2,3,4,3,2,1,2,2,1,1,2,1,-1,-1,1,1,-1,1,1 %N A156267 a(n)=A054353(2*n)-A078649(n). %F A156267 Conjectured to be o(n) %K A156267 sign %O A156267 1,2 %A A156267 _Benoit Cloitre_, Feb 07 2009