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 A146554 #4 Dec 18 2015 18:17:15 %S A146554 0,192,81764,90042690,171162841312 %N A146554 Number of n X n arrays of squares of integers summing to 39 with every element equal to at least one neighbor. %K A146554 nonn %O A146554 2,2 %A A146554 _R. H. Hardin_ Apr 14 2009