A222661 - OEIS

%I #4 Feb 28 2013 06:54:00

%S 0,2,2,44,110,2686,7624,186400,568750,13426930,43148672,976797964,

%T 3288287090,71553941138,250795793620,5271389823322,19133542669712,

%U 390312748312702,1460010782595862,29031771420777158,111430693524389896

%N Number of nX3 0..3 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

%C Column 3 of A222666

%H R. H. Hardin, <a href="/A222661/b222661.txt">Table of n, a(n) for n = 1..201</a>

%e All solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 28 2013