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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
1

%I #4 Feb 16 2014 05:46:40

%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