%I #9 Oct 19 2018 08:08:32
%S 156,1584,16228,166816,1716484,17668128,181881988,1872430816,
%T 19276479364,198450294432,2043038387332,21033017293408,
%U 216534315178372,2229214808561184,22949705750645380,236266598507573728
%N Number of (n+1) X (1+1) 0..3 arrays with the upper median unequal to the lower median in every 2 X 2 subblock.
%H R. H. Hardin, <a href="/A235843/b235843.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 14*a(n-1) - 31*a(n-2) - 94*a(n-3) + 192*a(n-4) + 192*a(n-5).
%F Empirical g.f.: 4*x*(39 - 150*x - 278*x^2 + 848*x^3 + 768*x^4) / (1 - 14*x + 31*x^2 + 94*x^3 - 192*x^4 - 192*x^5). - _Colin Barker_, Oct 19 2018
%e Some solutions for n=4:
%e ..2..0....2..3....0..1....1..0....0..2....0..1....2..3....0..2....0..2....1..0
%e ..1..0....0..1....3..0....3..0....0..2....1..0....1..3....3..0....1..3....3..2
%e ..0..2....0..2....0..3....0..3....2..0....2..0....3..0....1..0....0..3....0..3
%e ..2..1....2..0....0..2....2..3....2..1....1..2....1..3....3..0....0..1....2..1
%e ..0..2....3..1....2..0....3..1....3..3....1..2....1..3....3..0....2..3....3..1
%Y Column 1 of A235849.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 16 2014