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Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order
2

%I #5 Mar 06 2013 11:38:12

%S 0,4,32,613,7152,117140,1613820,24884991,363921808,5535894434,

%T 82950103964,1261556870873,19123754052912,291751166759784,

%U 4451928929497276,68156252881621777,1044588670185838192

%N Number of nX2 0..3 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

%C Column 2 of A222832

%H R. H. Hardin, <a href="/A222829/b222829.txt">Table of n, a(n) for n = 1..207</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 06 2013