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A189538
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Number of arrangements of n+1 nonzero numbers x(i) in -2..2 with the sum of trunc(x(i)/x(i+1)) equal to zero
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1
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4, 8, 44, 152, 552, 2000, 7628, 28440, 108792, 411888, 1586424, 6066032, 23474384, 90378912, 351072012, 1358520600, 5293045208, 20561697200, 80309986856, 312934745552, 1224770426672, 4784290151264, 18757260263352, 73421632108656
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OFFSET
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1,1
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COMMENTS
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Column 2 of A189545
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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=5
.-2....2....1...-2...-1....2...-1....2...-1...-1...-2...-2...-1...-1....2....2
..1...-2...-1...-1...-1...-1...-2...-1....1....2....2....2....1....2....2...-1
..2....2...-2....1....1...-1...-2....2...-2...-1...-1...-2....1...-1...-2....1
.-2....2....2...-1...-1...-1...-2....1...-1...-2...-1...-2...-1...-1...-2....1
.-2...-2....1....1...-2....1....1....1....1...-2...-1...-1...-1...-1...-2...-2
.-1...-1...-2....1...-2....1...-2...-1...-2...-2...-1....1...-2...-2....1...-1
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CROSSREFS
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Sequence in context: A045639 A337782 A285751 * A351071 A270352 A183394
Adjacent sequences: A189535 A189536 A189537 * A189539 A189540 A189541
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Apr 23 2011
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STATUS
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approved
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