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 A140310 #4 Mar 31 2012 12:35:07 %S A140310 1,2,16,502,61788,29829353,56365481377,417452923577327, %T A140310 12115365147171963168,1377708150938828616858899, %U A140310 613888995116283293759860580312,1071847970096627711898648239726154442 %N A140310 Number of n X n binary matrices containing no more than seven 1s in any 3 X 3 sub-block. %Y A140310 Cf. A139810. %K A140310 nonn %O A140310 0,2 %A A140310 _R. H. Hardin_, May 27 2008