A222790 - OEIS

%I #4 Mar 05 2013 18:01:05

%S 3,18,275,5896,137804,3315998,80934417,1992934141,49390328481,

%T 1230248849616,30772191192457,772421301648384,19447340783043671,

%U 490908234855685636,12420271942780692035,314872108569518327475

%N Number of nX4 0..3 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order

%C Column 4 of A222794

%H R. H. Hardin, <a href="/A222790/b222790.txt">Table of n, a(n) for n = 1..138</a>

%e Some solutions for n=3

%e ..0..1..0..1....0..1..1..1....0..0..0..1....0..0..1..2....0..1..2..0

%e ..0..1..1..1....0..1..1..1....0..0..0..2....0..0..1..1....3..0..0..0

%e ..1..1..1..1....1..1..1..0....0..0..0..2....1..1..1..1....0..0..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 05 2013