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 A146519 #4 Dec 18 2015 18:17:15 %S A146519 0,12,27636,12244717,5976334996,2692126890129 %N A146519 Number of n X n arrays of squares of integers summing to 25 with every element equal to at least one neighbor. %K A146519 nonn %O A146519 2,2 %A A146519 _R. H. Hardin_ Apr 14 2009