A222680 - OEIS

%I #4 Feb 28 2013 09:20:48

%S 2,1,5,10,25,150,359,2249,6511,39991,119033,747758,2254819,14115927,

%T 43486517,268330409,844434635,5129191736,16468845241,98454511005,

%U 322307191185,1896450581728,6325288982445,36644084370361,124416281370753

%N Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

%C Row 2 of A222679

%H R. H. Hardin, <a href="/A222680/b222680.txt">Table of n, a(n) for n = 1..45</a>

%e All solutions for n=3

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 28 2013