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 A044876 #5 Mar 30 2012 18:56:47 %S A044876 126,127,128,129,131,137,143,149,151,152,153,154,160,161,163,164,165, %T A044876 166,167,169,170,171,172,173,175,181,185,186,188,189,193,199,200,206, %U A044876 212,215,216,217,219,224,225,231,237,243,245 %N A044876 Numbers having, in base 5, (sum of even run lengths)=(sum of odd run lengths). %K A044876 nonn,base %O A044876 1,1 %A A044876 _Clark Kimberling_