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%I #4 Apr 18 2012 05:41:25
%S 69,533,4033,30177,223197,1634877,11870705,85525665,611921697,
%T 4350979769,30763863645,216419598445,1515531563165,10568991793581,
%U 73429250621533,508417994900109,3509319518941045,24154369305654701,165824297901834385
%N Number of -4..4 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having one, three or four distinct values for every i<=n and j<=n
%H R. H. Hardin, <a href="/A211692/b211692.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=5
%e .-2...-3...-3...-4...-2...-2...-4....0...-2...-2...-4...-3...-4...-4...-1...-4
%e ..4....2...-1....0....1...-3....4...-4....4....1....4....3...-3....3...-3....3
%e .-1....3...-4...-1...-2...-1....2....0....0....2....2...-2....2....4....4...-3
%e ..0...-2....3...-2...-4....2...-3...-4...-4....3...-2...-1....0...-3...-2...-4
%e ..0...-3....2....4....0...-3....3...-2...-3....4....1...-4...-4....4....0...-3
%e ..3....2...-4...-4...-4....0...-3....3....2...-4....0...-3....4...-3....3....4
%K nonn
%O 1,1
%A _R. H. Hardin_ Apr 18 2012
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