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 A146549 #4 Dec 18 2015 18:17:15 %S A146549 4,184,64818,52865784,60437290570 %N A146549 Number of n X n arrays of squares of integers summing to 34 with every element equal to at least one neighbor. %K A146549 nonn %O A146549 2,1 %A A146549 _R. H. Hardin_ Apr 14 2009