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%I A303794 #4 Apr 30 2018 17:10:05
%S A303794 2,4,12,24,64,184,432,1088,2944,7360,18496,48384,123392,312320,804864,
%T A303794 2061824,5248000,13449216,34455552,87961600,225038336,576143360,
%U A303794 1472741376,3766452224,9638051840,24648581120,63037702144,161266270208
%N A303794 Number of nX2 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.
%C A303794 Column 2 of A303800.
%H A303794 R. H. Hardin, <a href="/A303794/b303794.txt">Table of n, a(n) for n = 1..210</a>
%F A303794 Empirical: a(n) = 2*a(n-1) +8*a(n-3) -8*a(n-4) -8*a(n-5) for n>6
%e A303794 Some solutions for n=5
%e A303794 ..0..1. .0..1. .0..1. .0..0. .0..0. .0..0. .0..1. .0..0. .0..1. .0..0
%e A303794 ..1..0. .1..0. .0..1. .0..0. .1..0. .0..1. .1..0. .1..1. .1..0. .1..1
%e A303794 ..1..1. .1..1. .0..0. .0..1. .1..0. .0..1. .0..0. .1..1. .0..0. .1..1
%e A303794 ..1..1. .0..1. .0..0. .0..1. .1..1. .0..0. .1..0. .0..1. .1..0. .1..0
%e A303794 ..0..0. .1..0. .0..0. .1..1. .1..1. .0..0. .1..0. .0..1. .0..1. .1..0
%Y A303794 Cf. A303800.
%K A303794 nonn
%O A303794 1,1
%A A303794 _R. H. Hardin_, Apr 30 2018

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