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 A140308 #4 Mar 31 2012 12:35:07 %S A140308 1,2,16,382,33940,10537021,10478502929,36396596300106, %T A140308 433087032815881242,17394297682298725368562 %N A140308 Number of n X n binary matrices containing no more than five 1s in any 3 X 3 sub-block. %Y A140308 Cf. A139810. %K A140308 nonn %O A140308 0,2 %A A140308 _R. H. Hardin_, May 27 2008