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A190075
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Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero
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1
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0, 550, 5136, 25306, 88509, 249119, 599181, 1291797, 2542771, 4665542, 8142317, 13502963, 21463807, 33185295, 49745019, 72458535, 103375585, 144707600, 199040665, 269251217, 358360590, 471257436, 613624162, 789275327, 1002980959
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OFFSET
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1,2
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COMMENTS
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Row 5 of A190071
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..200
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EXAMPLE
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Some solutions for n=4
..4....2....3....2....2...-2...-3...-2....4....2...-3....3...-4...-2....1....1
.-2...-1...-4...-2....3...-4....3....3....4....2...-4....2....4....1...-3...-2
.-3....4....2....4....2....3....1...-1....3...-2....4....2....2...-1....2...-4
..4....3....2...-4....3...-2....2...-1....2....1...-2....3....2....2....1...-4
..4...-4...-3....4...-4...-2...-2...-2...-1...-4...-2....4...-4....4...-1....2
..4...-3...-3....1....4...-3....2...-1....3...-2...-2...-2....2....1...-2....3
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CROSSREFS
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Sequence in context: A141547 A236723 A189502 * A234415 A285925 A285861
Adjacent sequences: A190072 A190073 A190074 * A190076 A190077 A190078
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin May 04 2011
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STATUS
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approved
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