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 A048301 #6 Oct 13 2019 16:44:02 %S A048301 0,1,2,3,5,10,15,16,21,26,31,32,37,42,47,48,53,58,63,64,85,106,127, %T A048301 128,149,170,191,192,213,234,255,256,320,341,362,383,426,511,512,597, %U A048301 640,661,682,703,767,768,853,938,960,981,1002,1023,1024,1045,1066,1087 %N A048301 Numbers whose base-4 expansions, read from left to right, have run lengths that strictly increase. %Y A048301 Cf. A037015, A043693, A043707, A044815, A044953. %K A048301 nonn,base %O A048301 0,3 %A A048301 _Patrick De Geest_, Feb 15 1999