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 A146320 #4 Dec 18 2015 18:17:14 %S A146320 0,1,10742,1562979,19868428,116875556,471829672,1513833810,4145705032, %T A146320 10094479834,22430185920 %N A146320 Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 9 and every element equal to at least one neighbor. %K A146320 nonn %O A146320 3,3 %A A146320 _R. H. Hardin_ Apr 14 2009