%I #5 Feb 15 2014 13:54:19
%S 256,1780,12552,88544,635200,4438816,31507328,221652256,1584432064,
%T 11094868672,78930109696,554462140416,3957466858304,27739531863040,
%U 197546198927360,1386754238612992,9890947053918976,69362350056729600
%N Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Column 1 of A237911
%H R. H. Hardin, <a href="/A237905/b237905.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 1884*a(n4) +28048*a(n6) +134800*a(n8) +241600*a(n10) +86848*a(n12) 80384*a(n14) +25600*a(n16) for n>17
%e Some solutions for n=4
%e ..2..0....1..0....2..2....2..1....3..0....3..3....1..1....2..0....3..3....1..0
%e ..2..3....2..3....1..2....3..0....2..2....1..3....2..0....0..0....0..1....3..2
%e ..1..3....2..3....3..2....3..1....0..0....2..2....0..2....0..3....2..1....3..2
%e ..2..0....1..2....2..3....1..2....0..1....0..0....0..1....0..1....2..0....1..2
%e ..2..1....2..1....0..2....1..2....1..0....1..2....1..1....2..0....0..1....2..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 15 2014
