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%I #5 Mar 31 2012 12:36:37
%S 140,1820,21364,273728,3579520,47040968,622300326,8281149188,
%T 110718596524,1486040082748,20010711643976,270217094416868,
%U 3657780168834780,49618552941019396,674346504318284036
%N Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero
%C Column 7 of A199832
%H R. H. Hardin, <a href="/A199831/b199831.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for n=3
%e .-7...-1....5....0...-6....0....2...-3...-4....5...-7....4...-5...-6....0...-3
%e .-1....2...-7...-2...-5...-4....1...-7....3....0....6...-6....4....1....1...-3
%e .-4...-3...-6....6....3....6....3....0...-1...-7....2...-5....0...-3...-2....5
%e ..7...-3....2....0....7...-5....1....3....5....5....0....3...-2....2....3....7
%e ..5....5....6...-4....1....3...-7....7...-3...-3...-1....4....3....6...-2...-6
%K nonn
%O 1,1
%A _R. H. Hardin_ Nov 11 2011