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 A281805 #4 Jan 30 2017 10:44:27 %S A281805 0,34,324,1916,12318,71290,396185,2143364,11250451,57853036,292724002, %T A281805 1458437418,7182757280,35002131964,169019645294,809806421452, %U A281805 3852574230183,18214915308180,85640566518922,400632266290872 %N A281805 Number of 4Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. %C A281805 Row 4 of A281802. %H A281805 R. H. Hardin, <a href="/A281805/b281805.txt">Table of n, a(n) for n = 1..210</a> %e A281805 Some solutions for n=4 %e A281805 ..0..0..1..1. .0..1..0..1. .0..0..0..0. .0..0..1..0. .0..0..0..0 %e A281805 ..0..0..1..1. .1..0..1..0. .0..1..0..0. .1..1..0..0. .1..1..1..1 %e A281805 ..0..1..0..0. .0..1..1..1. .1..0..0..0. .1..1..0..1. .0..1..1..0 %e A281805 ..1..1..1..0. .1..0..0..0. .0..1..0..0. .0..0..1..0. .1..1..1..1 %Y A281805 Cf. A281802. %K A281805 nonn %O A281805 1,2 %A A281805 _R. H. Hardin_, Jan 30 2017