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 A140311 #8 Mar 09 2015 04:29:44 %S A140311 1,2,16,511,65089,33066176,66993993728,541344347284385, %T A140311 17445985904048740529,2242340146792849255134720, %U A140311 1149454044962768236388517543936,2349989206497316681704056634171383423 %N A140311 Number of n X n binary matrices containing no more than eight 1s in any 3 X 3 sub-block. %H A140311 R. H. Hardin, May 27 2008, <a href="/A140311/b140311.txt">Table of n, a(n) for n = 0..15</a> %Y A140311 Cf. A139810. %K A140311 nonn %O A140311 0,2 %A A140311 _R. H. Hardin_, May 27 2008