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 A200059 Number of -n..n arrays x(0..4) of 5 elements with zero sum and elements alternately strictly increasing and strictly decreasing 1

%I

%S 6,68,288,840,1948,3914,7074,11862,18732,28244,40970,57598,78816,

%T 105444,138284,178282,226362,283598,351026,429852,521230,626492,

%U 746910,883944,1038982,1213616,1409348,1627896,1870884,2140158,2437454,2764750,3123900

%N Number of -n..n arrays x(0..4) of 5 elements with zero sum and elements alternately strictly increasing and strictly decreasing

%C Row 5 of A200057

%H R. H. Hardin, <a href="/A200059/b200059.txt">Table of n, a(n) for n = 1..200</a>

%F Empirical: a(n) = 2*a(n-1) -a(n-3) -2*a(n-5) +2*a(n-6) +a(n-8) -2*a(n-10) +a(n-11)

%e Some solutions for n=6

%e ..1...-1....3...-6...-4...-1....1....4....6...-3....5...-1....1....1....1...-2

%e ..0....2...-6....2....3...-5....2...-6...-1...-5...-6....2...-1....5...-2....6

%e ..1...-2....4...-3...-3....5...-6....3....3....5....6...-4....4...-2....2...-5

%e .-3....5...-5....4....4...-1....4...-3...-5....1...-4....2...-3...-1...-5....1

%e ..1...-4....4....3....0....2...-1....2...-3....2...-1....1...-1...-3....4....0

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 13 2011

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