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A200056
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Number of -7..7 arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing
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1
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1, 14, 106, 850, 7074, 59910, 514168, 4453946, 38855488, 341052122, 3006680636, 26619825378, 236386648574, 2105717447626, 18798362729604, 168222072625668, 1507848061916274, 13541292792666004, 121763260320351938
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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=6
..1....3....1...-6...-5....4...-1....2...-1...-5....6...-3....0...-6....6....1
..5...-4....3....4...-6....5....4...-4....2....6...-1...-1...-4....7...-3....2
.-2...-1....2...-6....4...-5...-5...-1...-3...-4....1...-5....7...-7....7...-3
..7...-5....5....1...-1....0....0...-2....3....4...-7....5...-5....0...-3....5
.-7....6...-7....0....6...-3...-3....5...-4...-7....4....0....5...-1....0...-7
.-4....1...-4....7....2...-1....5....0....3....6...-3....4...-3....7...-7....2
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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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