Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #7 Jul 28 2022 21:53:16
%S 28,784,21952,424401,8210464,151889331,2710884810,48083827685,
%T 844714479714,14772128520081,257802672361640,4491710608316816,
%U 78198928468727304,1360792591701114315,23673324742422186018
%N Number of n X 5 binary arrays without the pattern 0 0 1 1 diagonally, vertically or horizontally.
%C Column 5 of A189161.
%H R. H. Hardin, <a href="/A189157/b189157.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for 4 X 5
%e ..0..1..0..1..0....0..0..1..0..1....0..1..0..0..1....0..0..0..0..1
%e ..0..0..1..0..0....1..0..1..0..1....1..1..1..1..1....1..1..1..0..0
%e ..0..1..0..0..1....0..0..1..0..1....0..1..1..0..1....0..1..0..1..1
%e ..1..1..1..0..0....0..1..0..0..0....0..1..1..0..0....1..1..0..0..1
%Y Cf. A189161.
%K nonn
%O 1,1
%A _R. H. Hardin_, Apr 17 2011