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%I #5 Mar 31 2012 12:36:47
%S 1,7,57,509,4643,43293,408211,3882871,37183105,358012837,3462520849,
%T 33613331019,327348848723,3196657505737,31290407955317,
%U 306922478150245,3016082294628575,29687026287677819,292634127970865519
%N Number of zero-sum -6..6 arrays of n elements with adjacent element differences also in -6..6
%C Column 6 of A202252
%H R. H. Hardin, <a href="/A202250/b202250.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=6
%e .-2....4...-3....4....1....0...-2....3....6....3....0....2....3...-2....1....1
%e ..2....2...-2...-1...-3....0...-1...-3....1....0....2...-3....0...-3....4...-1
%e ..5....3....1...-4...-2....6....2...-4...-4....1...-1....0....5....1...-2...-4
%e ..1...-1....5...-5....3....1....1...-1...-6...-1....4...-3....0....1...-3...-1
%e .-3...-5....1....0...-2...-1....1....3...-1....1...-2...-1...-2....3...-3....4
%e .-3...-3...-2....6....3...-6...-1....2....4...-4...-3....5...-6....0....3....1
%K nonn
%O 1,2
%A _R. H. Hardin_ Dec 14 2011
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