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A199708
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Number of -n..n arrays x(0..5) of 6 elements with zero sum and no two neighbors equal
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3
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32, 708, 4964, 20116, 59992, 147072, 314532, 608420, 1089752, 1836600, 2946204, 4537152, 6751384, 9756388, 13747296, 18948952, 25618064, 34045344, 44557532, 57519592, 73336788, 92456792, 115371796, 142620672, 174790996, 212521224
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n)=3*a(n-1)-2*a(n-2)-a(n-3)+2*a(n-5)-a(n-6)-a(n-7)+2*a(n-8)-a(n-10)-2*a(n-11)+3*a(n-12)-a(n-13)
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EXAMPLE
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Some solutions for n=5
..5....0....0....1....1....2...-2....5....0....2...-1...-1....0....0...-5...-4
..0...-3....1...-5...-1...-2....5....1...-5....1....1....2....4....4....5...-1
.-1....5....3....4....1....4...-1...-4....1....2...-2...-5....0....1...-3....1
.-5....2...-1....2....3...-1....1...-2....5...-5....5....5...-1...-3....1....2
..0...-1....1...-2...-4...-3...-4...-4...-3...-4....0....0....2...-4....4....3
..1...-3...-4....0....0....0....1....4....2....4...-3...-1...-5....2...-2...-1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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