%I #5 Feb 16 2014 06:17:06
%S 256,1280,6400,34560,186624,1022976,5607424,30916608,170459136,
%T 939196416,5174788096,28562620416,157653467136,868872880128,
%U 4788604370944,26432558333952,145904753442816,804133590269952,4431869529554944
%N Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median plus the lower median plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Column 1 of A237956
%H R. H. Hardin, <a href="/A237952/b237952.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 976*a(n-4) -46848*a(n-8) +110592*a(n-12)
%e Some solutions for n=5
%e ..0..0....2..1....2..2....0..0....1..0....0..1....0..3....0..2....0..3....2..2
%e ..0..1....1..1....3..1....2..3....3..3....2..2....2..1....3..1....1..1....2..1
%e ..0..1....2..2....3..0....0..1....0..2....0..2....1..3....3..0....2..0....3..2
%e ..0..0....0..3....3..2....2..2....3..2....3..2....3..1....0..3....1..2....2..0
%e ..0..0....1..2....2..0....1..1....1..0....3..0....3..0....2..0....1..0....1..3
%e ..1..0....0..2....3..1....1..2....3..3....3..1....2..1....2..0....0..2....2..1
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 16 2014
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