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 A146500 #4 Dec 18 2015 18:17:14 %S A146500 0,72,9780,668362,173484536,10081326340,182802386772,1760679542512, %T A146500 11472302452452 %N A146500 Number of n X n arrays of squares of integers summing to 15 with every element equal to at least one neighbor. %K A146500 nonn %O A146500 2,2 %A A146500 _R. H. Hardin_ Apr 14 2009