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 A146502 #4 Dec 18 2015 18:17:14 %S A146502 0,186,41444,7687870,8221000176,599346431860 %N A146502 Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 15 and every element equal to at least one neighbor. %K A146502 nonn %O A146502 3,2 %A A146502 _R. H. Hardin_ Apr 14 2009