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A200189
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Number of -5..5 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing
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1
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1, 10, 44, 242, 1298, 7266, 40632, 231916, 1320876, 7630236, 43951298, 255926506, 1485664226, 8700154180, 50792100530, 298703878402, 1751415860436, 10333766393384, 60797757383394, 359661008763242, 2121869963574120
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=5
.-1...-3....4....2....1...-4...-5...-1...-1...-1....2....2...-3....0....2...-3
..2....5...-4....4...-4....3....2...-5....5....4...-4....4....5....4....5....5
.-4...-2....1...-3....5...-3...-3....3...-4...-1....2...-5...-3...-3...-5...-1
..4....1...-2....0...-2....5....4...-1....1....1...-3....1....2....1....0....2
.-1...-1....1...-3....0...-1....2....4...-1...-3....3...-2...-1...-2...-2...-3
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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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