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%I #6 Dec 19 2015 09:51:01
%S 25,340,1740,9016,44916,223788,1119424,5621396,28130560,140718764,
%T 704493864,3528165236,17658676752,88394841700,442557740144,
%U 2215472575772,11090095537400,55519269652292,277940545496176,1391364670745476
%N Number of 2Xn 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique.
%C Row 2 of A265928.
%H R. H. Hardin, <a href="/A265930/b265930.txt">Table of n, a(n) for n = 1..210</a>
%H R. H. Hardin, <a href="/A265930/a265930.txt">Empirical recurrence of order 55</a>
%F Empirical recurrence of order 55 (see link above)
%e Some solutions for n=4
%e ..0..4..4..3....3..2..4..3....3..1..0..4....4..4..0..1....1..1..3..3
%e ..2..1..3..0....2..0..3..2....1..3..4..0....3..0..1..4....2..0..0..4
%Y Cf. A265928.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 18 2015
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