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Half the number of nX4 binary arrays with no element equal to a strict majority of its knight-move neighbors
1

%I #5 Mar 31 2012 12:35:51

%S 8,8,69,156,451,2595,12150,58407,280852,1405171,7015294,34368476,

%T 167469177,825952633,4089662044,20170838069,99218328768,488970338928,

%U 2413015142592,11903686509071,58695278806839,289412617546604

%N Half the number of nX4 binary arrays with no element equal to a strict majority of its knight-move neighbors

%C Column 4 of A183397

%H R. H. Hardin, <a href="/A183395/b183395.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions with a(1,1)=0 for 5X4

%e ..0..0..0..1....0..0..1..1....0..1..0..0....0..1..0..0....0..1..0..1

%e ..1..0..1..1....0..0..1..1....1..1..1..0....1..1..0..0....1..0..1..0

%e ..1..1..0..1....1..0..1..1....0..1..0..0....1..1..0..0....0..0..1..1

%e ..1..0..0..0....0..0..0..1....0..0..0..0....0..0..1..1....0..0..1..1

%e ..0..1..0..1....1..0..1..1....1..1..1..1....0..0..1..1....1..0..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 04 2011