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 A156723 #4 Jun 02 2025 01:22:31 %S A156723 0,1,0,1,0,1,2,3,2,3,4,3,4,3,4,5,4,5,4,5,6,7,6,7,8,9,8,9,8,9,10,9,10, %T A156723 11,12,11,12,13,12,13,12,13,14,15,14,15,16,17,16,17,18,17,18,17,18,19, %U A156723 18,19,18,19,20,21,20,21,22,21,22,21,22,23,22,23,24,25,24,25,26,27,26,27 %N A156723 a(n)=A156253(n)-A156251(n). %C A156723 a(2n) is odd, a(2n+1) is even. %F A156723 a(n) is expected to be asymptotic to n/3. %K A156723 nonn %O A156723 1,7 %A A156723 _Benoit Cloitre_, Feb 14 2009