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 A156268 #4 Jun 02 2025 01:21:36 %S A156268 0,2,2,1,1,2,2,2,2,2,3,3,2,2,2,0,-1,1,2,2,2,1,1,2,0,0,2,1,1,1,0,0,1,1, %T A156268 1,1,0,2,3,1,1,2,2,2,3,3,4,4,2,2,2,1,1,2,2,3,5,3,1,2,2,2,2,2,3,3,1,1, %U A156268 2,2,0,1,1,2,2,2,3,3,2,2,2,2,3,5,3,2,4,3,3,3,3,4,4,3,3,3,1,0,2,3,1,3,2,2,2 %N A156268 a(n)=2*A054353(n)-A078649(n). %F A156268 Conjectured to be o(n) %K A156268 sign %O A156268 1,2 %A A156268 _Benoit Cloitre_, Feb 07 2009