A222543 - OEIS

%I #4 Feb 24 2013 07:16:18

%S 4,5,9,32,70,361,842,4314,10268,51979,125504,636450,1549956,7874707,

%T 19306562,98320042,241866468,1235742867,3045772687,15611773095,

%U 38529726995,198047702901,489385598261,2521222747131,6237733850714

%N Number of 3Xn 0..1 arrays with no more than floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order

%C Row 3 of A222541

%H R. H. Hardin, <a href="/A222543/b222543.txt">Table of n, a(n) for n = 1..77</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 24 2013