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 A044866 #7 Jan 18 2018 03:49:21 %S A044866 100,110,112,113,114,115,116,117,118,119,122,133,144,155,166,177,188, %T A044866 199,200,211,220,221,223,224,225,226,227,228,229,233,244,255,266,277, %U A044866 288,299,300,311,322,330,331,332,334,335,336 %N A044866 Positive integers having the same number of base-10 runs of odd length as even. %K A044866 nonn,base %O A044866 1,1 %A A044866 _Clark Kimberling_