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 A140305 #4 Mar 31 2012 12:35:07 %S A140305 1,2,11,46,824,27178,1020762,102044420,20297233254,6218446852487, %T A140305 3906297811846469,4829512709969500388,10588146860457194561192, %U A140305 44163637535605999104548698 %N A140305 Number of n X n binary matrices containing no more than two 1s in any 3 X 3 sub-block. %Y A140305 Cf. A139810. %K A140305 nonn %O A140305 0,2 %A A140305 _R. H. Hardin_, May 27 2008