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A199896
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Number of -6..6 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative
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1
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1, 13, 67, 545, 3573, 27457, 193689, 1462859, 10651367, 80142549, 593254327, 4466635929, 33386730231, 251884546233, 1894568061637, 14327147198653, 108231414777793, 820328179730055, 6216861991058925, 47216885967426099
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OFFSET
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1,2
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COMMENTS
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Column 6 of A199898
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..200
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EXAMPLE
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Some solutions for n=6
.-5....3....5...-3...-2....2....2....2...-5....2....0....0...-6....0...-1...-2
..2....0...-4....2....3....0...-5...-3....5...-2....1...-3....5...-2....3....2
.-2....4....2....0....0....2....5....2...-3....3...-5....6....0....3...-6...-3
..6...-4...-5....0...-1...-2...-4...-4....0...-6....5...-2...-2...-1....3....0
..0....0....4....6....1....2....6....4...-1....6...-1....3....0....6...-4....3
.-1...-3...-2...-5...-1...-4...-4...-1....4...-3....0...-4....3...-6....5....0
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CROSSREFS
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Sequence in context: A141956 A290244 A137720 * A213355 A229999 A258618
Adjacent sequences: A199893 A199894 A199895 * A199897 A199898 A199899
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Nov 11 2011
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STATUS
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approved
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