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A199937
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Number of -2..2 arrays x(0..n-1) of n elements with zeroth through n-1st differences all nonzero
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0
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4, 12, 36, 104, 302, 868, 2490, 7132, 20424, 58418, 167036, 477412, 1364340, 3898236, 11138194, 31824012, 90926724, 259790792, 742259560, 2120727868, 6059178186, 17311798890, 49461883130, 141318491362, 403763748824
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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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EXAMPLE
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Some solutions for n=6
.-2....2....2...-2....1...-2....1...-2...-1....1...-1...-1...-2...-1....2....2
..2...-1...-1....1....2....2...-2....1....1....2....1...-2....2...-2...-1....1
.-1....2...-2...-1....1....1...-1...-2....2...-1...-2....2....1....1....2....2
.-2...-1....1....2....2...-1....1....2....1....2...-1...-1....2....2...-2....1
..2....2....2...-2....1...-2...-2...-1....2...-1....2....1...-1...-2...-1....2
.-2....1...-1...-1...-1....1...-1....1...-1...-2....1...-2....1...-1....1...-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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