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 A146300 #5 Jun 16 2015 14:16:30 %S A146300 0,1,1640,123744,1546356,9282128,37896264,121782952,331901924, %T A146300 801191922,1761200680,3592793804,6894127812,12569395174 %N A146300 Number of n X n arrays of squares of integers summing to 9 with every element equal to at least one neighbor. %K A146300 nonn %O A146300 2,3 %A A146300 _R. H. Hardin_, Apr 14 2009