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 A146506 #4 Dec 18 2015 18:17:14 %S A146506 4,90,12424,2808172,449235282,107282960684,5345302912844, %T A146506 102834566977650 %N A146506 Number of n X n arrays of squares of integers summing to 18 with every element equal to at least one neighbor. %K A146506 nonn %O A146506 2,1 %A A146506 _R. H. Hardin_ Apr 14 2009