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%I #4 Feb 16 2014 06:36:14
%S 81,340,1422,6042,25777,109200,462852,1962464,8337456,35340888,
%T 150013756,635934272,2700293296,11446693312,48598395488,206013123488,
%U 874700630800,3707927149312,15742965653824,66735768122368,283346471210496
%N Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Column 1 of A237965
%H R. H. Hardin, <a href="/A237958/b237958.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 216*a(n-4) +1692*a(n-6) +4288*a(n-8) +3968*a(n-10) +1024*a(n-12)
%e Some solutions for n=5
%e ..1..1....2..1....2..1....0..1....0..1....2..2....0..1....0..1....1..2....1..1
%e ..2..2....1..1....2..1....0..0....2..2....2..2....1..2....0..1....1..1....0..0
%e ..0..1....2..0....0..2....2..0....0..0....1..2....2..1....1..1....0..0....0..0
%e ..0..2....0..1....1..0....1..2....1..1....1..1....1..0....0..2....0..2....1..1
%e ..2..1....0..0....0..1....0..0....0..1....0..2....1..1....0..1....2..1....1..0
%e ..2..1....2..1....1..1....0..1....2..1....2..0....0..0....1..0....1..1....2..2
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 16 2014
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