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 A110301 #3 Sep 24 2018 16:53:14 %S A110301 0,1,2,21,22,32,321,322,332,432,4321,4322,4332,4432,5432,54321,54322, %T A110301 54332,54432,55432,65432,654321,654322,654332,654432,655432,665432, %U A110301 765432,7654321,7654322,7654332,7654432,7655432,7665432,7765432,8765432 %N A110301 Integers written in base "triangle". %C A110301 To convert an integer to base triangle: %C A110301 Write the integer as a group of ones (6 is shown below). %C A110301 1 1 1 1 1 1 %C A110301 Iteratively redistribute the leftmost value, adding 1 to each value to its right. %C A110301 2 1 1 1 1 %C A110301 2 2 1 1 %C A110301 3 2 1 %C A110301 Stop when the leftmost value is greater than the number of values to its right. %K A110301 easy,nonn,base %O A110301 0,3 %A A110301 _Andrew S. Plewe_, Sep 07 2005