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 A156724 #4 Jun 02 2025 01:22:38 %S A156724 1,1,1,3,3,3,3,5,5,5,7,7,9,9,9,9,11,11,13,13,13,15,15,17,17,17,17,19, %T A156724 19,19,21,21,21,21,23,23,25,25,27,27,27,27,27,29,29,31,31,31,31,31,33, %U A156724 33,35,35,37,37,37,37,39,39,39,41,41,41,43,43,43,43,45,45,45,47,47,49,49 %N A156724 a(n)=A156253(2n)-A156251(2n). %C A156724 a(n) is odd. %F A156724 a(n) is expected to be asymptotic to 2n/3. %K A156724 nonn %O A156724 1,4 %A A156724 _Benoit Cloitre_, Feb 14 2009