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A200191
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Number of -7..7 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, 14, 90, 688, 5300, 41938, 334278, 2702398, 21910764, 179391752, 1470318926, 12138752566, 100237526220, 832451175714, 6911760321744, 57654489610890, 480698731253616, 4023489592590784, 33656450218770442, 282477294114249058
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listen;
history;
text;
internal format)
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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
.-4....0...-3...-3...-1...-7....5....6...-6...-2...-6....2....0...-7...-3...-4
..4....6....5....5....7....5...-7...-6....0....4....1...-4....4....4....2...-6
.-5...-3...-5....0...-1...-4....7....2...-3...-5...-4....3...-5...-2...-7....4
..5....2....6....4....2....7...-7...-4....6....4....6...-5....2....6....6....2
..0...-5...-3...-6...-7...-1....2....2....3...-1....3....4...-1...-1....2....4
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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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