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 A048219 #4 Mar 30 2012 18:56:54 %S A048219 2,1,2,3,3,4,3,5,6,4,4,7,4,5,8,9,6,5,5,10,5,11,6,12,13,14,6,6,7,6,9, %T A048219 15,16,17,7,8,18,19,7,7,20,7,9,8,21,12,22,23,13,8,10,9,24,8,8,25,8,11, %U A048219 26,9,27,28,10,29,16,9,17,30,31,9,9,10,9,32,14 %N A048219 a(n)=least m such that row m of T contains n, array T given by A048212. %K A048219 nonn %O A048219 1,1 %A A048219 _Clark Kimberling_