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

%I #4 Mar 11 2013 13:45:34

%S 2,4,7,18,41,119,295,825,2060,5873,15234,42492,111787,313666,836575,

%T 2327389,6276477,17477473,47431027,131755956,359950638,999799707,

%U 2741682652,7613006585,20955577878,58193926348,160583108286,446091089120

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

%C Row 2 of A223012

%H R. H. Hardin, <a href="/A223013/b223013.txt">Table of n, a(n) for n = 1..107</a>

%e All solutions for n=3

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 11 2013