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

%I #4 Feb 28 2013 07:13:36

%S 3,9,40,348,2370,20606,212842,2134959,21085549,211716164,2136631932,

%T 21522095442,217024139551,2193065402495,22187387560680,

%U 224679112979344,2277631748750522,23112487299379689,234748284433308243

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

%C Column 4 of A222673

%H R. H. Hardin, <a href="/A222669/b222669.txt">Table of n, a(n) for n = 1..126</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 28 2013