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 A048320 #6 Oct 13 2019 16:34:38 %S A048320 0,1,2,3,4,5,6,7,8,10,20,30,40,50,60,70,80,90,91,92,93,94,95,96,97,98, %T A048320 180,181,182,183,184,185,186,187,188,270,271,272,273,274,275,276,277, %U A048320 278,360,361,362,363,364,365,366,367,368,450,451,452,453,454,455,456 %N A048320 Numbers whose base-9 expansions, read from left to right, have run lengths that strictly decrease. %Y A048320 Cf. A037013, A043698, A043712, A044820, A044958. %K A048320 nonn,base %O A048320 0,3 %A A048320 _Patrick De Geest_, Feb 15 1999