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 A032884 #9 Feb 12 2021 21:39:50
%S A032884 1,2,3,4,5,10,11,15,16,17,20,21,22,23,35,36,40,41,42,45,46,47,48,65,
%T A032884 66,67,70,71,72,73,95,96,97,98,130,135,136,140,141,142,145,146,147,
%U A032884 148,255,260,261,265,266,267,270,271,272,273,285
%N A032884 Numbers whose base-5 representation Sum_{i=0..m} d(i)*5^i has d(0) < d(1) > d(2) < ...
%K A032884 nonn,base
%O A032884 1,2
%A A032884 _Clark Kimberling_