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%I #5 Feb 09 2014 05:58:25
%S 256,1888,14208,106496,798208,5985280,44879872,336408576,2521595904,
%T 18907365376,141774028800,1062710738944,7965687414784,59728115007488,
%U 447862357884928,3357089663549440,25163504533110784,188680351567052800
%N Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the lower median minus the upper median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Column 1 of A237544
%H R. H. Hardin, <a href="/A237539/b237539.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 3120*a(n-4) +121600*a(n-8) +4931584*a(n-12) -10485760*a(n-16) for n>17
%e Some solutions for n=4
%e ..3..2....1..1....3..3....0..0....3..0....2..2....2..0....0..0....2..2....0..3
%e ..3..2....1..2....0..0....3..3....1..3....1..3....2..3....1..2....2..2....2..1
%e ..3..3....0..3....2..1....2..3....2..2....1..0....0..3....2..1....0..1....0..2
%e ..0..0....0..2....3..2....2..3....3..0....3..0....2..0....3..1....3..2....2..2
%e ..1..2....3..3....1..3....1..3....2..3....3..3....1..1....3..1....0..0....1..0
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 09 2014
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