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 A032851 #9 Feb 12 2021 20:53:23
%S A032851 1,2,3,5,6,7,10,11,15,20,21,24,25,26,28,29,30,31,40,41,42,44,45,46,47,
%T A032851 60,61,62,63,80,81,82,83,85,86,87,96,97,98,99,101,102,103,106,107,112,
%U A032851 113,114,115,117,118,119,122,123,127,160,161
%N A032851 Numbers whose base-4 representation Sum_{i=0..m} d(i)*4^i has d(m) <= d(m-1) >= d(m-2) <= ...
%K A032851 nonn,base
%O A032851 1,2
%A A032851 _Clark Kimberling_