A222667 - OEIS

%I #5 Feb 28 2013 07:12:08

%S 0,0,2,9,24,80,288,1038,3608,12696,45024,160364,571200,2039424,

%T 7297632,26163672,93938304,337754400,1215965472,4382841504,

%U 15814326912,57117508992,206479723776,747042295968,2704860854400,9800596459776

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

%C Column 2 of A222673

%H R. H. Hardin, <a href="/A222667/b222667.txt">Table of n, a(n) for n = 1..210</a>

%e All solutions for n=3

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Feb 28 2013