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 A146503 #4 Dec 18 2015 18:17:14 %S A146503 1,92,11280,1104960,254787279,24163544599,600100462863,7188707496364 %N A146503 Number of n X n arrays of squares of integers summing to 16 with every element equal to at least one neighbor. %K A146503 nonn %O A146503 2,2 %A A146503 _R. H. Hardin_ Apr 14 2009