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Number of 5Xn 0..2 arrays with exactly floor(5Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order
1

%I #4 Mar 14 2013 17:17:21

%S 0,1440,255216,45578462,5423134897,1004385117484,117100753812154,

%T 22365330024188924,2599966609036869704,506588140729236598506,

%U 58901602084610433505785,11633559506920886240645721

%N Number of 5Xn 0..2 arrays with exactly floor(5Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

%C Row 5 of A223104

%H R. H. Hardin, <a href="/A223108/b223108.txt">Table of n, a(n) for n = 1..17</a>

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 14 2013