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 A049825 #4 Mar 30 2012 18:56:59 %S A049825 0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,2,2,0,1,0,2,0,3,3,2,2,3,1,4,2,4,2, %T A049825 2,4,6,4,6,3,7,3,10,2,5,6,6,5,6,7,6,7,13,8,6,5,9,10,14,3,19,10,11,8,8, %U A049825 7,14,8,10,9 %N A049825 a(n)=number of 4's in n-th row of array T given by A049816. %K A049825 nonn %O A049825 1,18 %A A049825 _Clark Kimberling_