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 A044884 #5 Mar 30 2012 18:56:49 %S A044884 2198,2199,2200,2201,2202,2203,2204,2205,2206,2207,2208,2209,2211, %T A044884 2225,2239,2253,2267,2281,2295,2309,2323,2337,2351,2365,2367,2368, %U A044884 2369,2370,2371,2372,2373,2374,2375,2376,2377,2378 %N A044884 Numbers having, in base 13, (sum of even run lengths)=(sum of odd run lengths). %K A044884 nonn,base %O A044884 1,1 %A A044884 _Clark Kimberling_