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 A156726 #4 Jun 02 2025 01:22:45 %S A156726 0,0,0,2,2,4,4,4,4,4,6,6,8,8,8,10,10,12,12,12,12,14,14,16,16,18,18,18, %T A156726 18,18,20,20,22,22,22,22,24,24,26,26,26,28,28,28,30,30,30,30,32,32,32, %U A156726 34,34,36,36,36,36,38,38,40,40,40,40,40,42,42,44,44,44,44,44,46,46,48 %N A156726 a(n)=A156253(2n-1)-A156251(2n-1). %C A156726 a(n) is even. %F A156726 a(n) is expected to be asymptotic to 2n/3. %K A156726 nonn %O A156726 1,4 %A A156726 _Benoit Cloitre_, Feb 14 2009