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 A044952 #5 Mar 30 2012 18:56:49 %S A044952 1,2,4,8,9,10,12,13,14,16,17,18,20,22,23,24,25,26,27,31,37,39,40,41, %T A044952 43,49,53,54,62,67,71,74,77,78,79,80,81,82,84,85,90,91,93,94,108,109, %U A044952 111,112,117,118,120,121,122,124,125,130,131,133 %N A044952 Numbers with no two equally numerous base 3 digits. %K A044952 nonn,base %O A044952 1,2 %A A044952 _Clark Kimberling_