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Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order
1

%I #4 Mar 13 2013 04:37:24

%S 6,508,95648,17704612,3345698159,642902149269,125023235986060,

%T 24532345137855558,4847658520889741087,963306978592566283718,

%U 192306743440029495693971,38537949083984617104985257

%N Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

%C Column 4 of A223052

%H R. H. Hardin, <a href="/A223050/b223050.txt">Table of n, a(n) for n = 1..23</a>

%e Some solutions for n=3

%e ..0..0..1..0....0..1..0..0....0..1..0..2....0..1..0..2....0..1..2..2

%e ..2..3..2..1....0..2..3..0....2..1..1..3....3..3..3..1....0..0..0..1

%e ..3..1..0..3....1..2..2..0....0..1..0..0....2..2..3..2....3..1..3..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 13 2013