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 A146204 #4 Dec 18 2015 18:17:14 %S A146204 0,48,281740,6164286,36452297,137540680,403558893 %N A146204 Number of n X n arrays of squares of integers with every (n-3)X(n-3) subblock summing to 7 and every element equal to at least one neighbor. %K A146204 nonn %O A146204 5,2 %A A146204 _R. H. Hardin_ Apr 14 2009