%I #4 Feb 14 2013 20:26:41

%S 3,11,35,208,1125,6619,40321,250681,1569385,9860229,62350467,

%T 395971584,2523482587,16126203359,103311906743,663339238220,

%U 4267302505247,27498492193747,177468748791963,1146905501859999,7421110682709531

%N Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..1 order

%C Column 4 of A222290

%H R. H. Hardin, <a href="/A222286/b222286.txt">Table of n, a(n) for n = 1..136</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 14 2013