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%I #4 Dec 19 2015 09:45:10
%S 340,7656,23920,74248,230784,721864,2263704,7152956,22522200,71566116,
%T 226074624,720236752,2280992736,7276115664,23077516368,73669330232,
%U 233938714232,747052012824,2374072906440,7582196847884,24110436293280
%N Number of nX4 0..4 arrays with the absolute differences of each element with its with horizontal and vertical neighbors unique.
%C Column 4 of A265973.
%H R. H. Hardin, <a href="/A265969/b265969.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..4..4..0..1....0..3..4..1....0..1..3..3....1..1..3..0....3..1..0..4
%e ..0..1..3..3....0..3..4..0....3..1..4..0....3..0..4..4....3..4..0..1
%e ..0..1..4..4....4..1..1..3....2..0..4..1....3..0..1..1....0..4..3..3
%e ..3..3..2..2....3..0..0..4....2..0..3..3....1..4..3..3....2..1..1..0
%Y Cf. A265973.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 19 2015
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