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 A146517 #4 Dec 18 2015 18:17:15 %S A146517 0,64,23924,7262690,3369041920,1194672642926 %N A146517 Number of n X n arrays of squares of integers summing to 23 with every element equal to at least one neighbor. %K A146517 nonn %O A146517 2,2 %A A146517 _R. H. Hardin_ Apr 14 2009