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 A146513 #4 Dec 18 2015 18:17:15 %S A146513 0,60,11108,3713772,614556476,198832564524,14492630383404 %N A146513 Number of n X n arrays of squares of integers summing to 19 with every element equal to at least one neighbor. %K A146513 nonn %O A146513 2,2 %A A146513 _R. H. Hardin_ Apr 14 2009