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%I #8 Dec 30 2012 04:01:59
%S 1,10,82,724,6504,59992,559028,5252900,49700882,472873888,4519281222,
%T 43353372676,417214414596,4026070558436,38943205468034,
%U 377469980604452,3665456335373858,35651726951195532,347268836196275908
%N Number of -5..5 arrays x(0..n-1) of n elements with zero sum and no two neighbors equal
%C Column 5 of A199704
%H R. H. Hardin, <a href="/A199701/b199701.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for n=5
%e .-1....3...-2...-5....3....4....1....1....5....3....1....2....4...-4....0...-2
%e ..1...-1....1....3...-1...-1...-5...-2...-1....1...-2...-1....1....4...-3....2
%e .-1...-4....4...-2....2....1....1....0...-4....2....2...-4...-4...-2....4...-1
%e ..1...-2....1....4...-1...-3....0....5...-5...-5...-1....5...-3....3....1....4
%e ..0....4...-4....0...-3...-1....3...-4....5...-1....0...-2....2...-1...-2...-3
%K nonn
%O 1,2
%A _R. H. Hardin_ Nov 09 2011