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 A032848 #9 Feb 12 2021 20:48:29
%S A032848 1,2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,23,24,25,26,27,28,29,34,35,
%T A032848 36,37,38,39,45,46,47,48,49,56,57,58,59,67,68,69,78,79,89,120,121,130,
%U A032848 131,132,140,141,142,143,150,151,152,153,154
%N A032848 Numbers whose base-10 representation Sum_{i=0..m} d(i)*10^i has d(m) < d(m-1) > d(m-2) < ...
%K A032848 nonn,base
%O A032848 1,2
%A A032848 _Clark Kimberling_