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%I
%S 1718,19694,228866,2744048,32465580,383375880,4542257982,54067139244,
%T 641031056118,7590349989188,90016555755486,1069015366100190,
%U 12678249163053274,150277119869692568,1782427688138307804
%N Number of (n+1)X(2+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
%C Column 2 of A237936
%H R. H. Hardin, <a href="/A237932/b237932.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=2
%e ..3..1..0....1..0..0....3..2..1....1..3..0....1..1..2....3..3..3....1..3..2
%e ..1..0..2....0..1..0....0..0..0....0..1..2....1..0..3....2..0..3....3..2..3
%e ..2..0..2....1..1..0....1..3..2....2..3..3....0..2..0....2..3..2....3..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 16 2014
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