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 A146508 #4 Dec 18 2015 18:17:15 %S A146508 4,116,59082,38462980,22016885138 %N A146508 Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 18 and every element equal to at least one neighbor. %K A146508 nonn %O A146508 3,1 %A A146508 _R. H. Hardin_ Apr 14 2009