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A188360
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Number of arrangements of 5 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero
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1
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91, 565, 1775, 4201, 8051, 14477, 22583, 34625, 49755, 69749, 91855, 123945, 155779, 197533, 247399, 304785, 361755, 440021, 512415, 611097, 715123, 826765, 936711, 1090865, 1233531, 1393541, 1568623, 1774089, 1955795, 2212029, 2421127, 2686881
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OFFSET
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1,1
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COMMENTS
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Row 4 of A188358
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..47
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EXAMPLE
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Some solutions for n=4
..4....1....4...-3...-2...-1....1...-4...-3....2....3...-1....1....3...-2....0
..1...-4....3....1....0....3....3...-3....0....0....0....0....0...-1....2....0
..1....4...-2...-2...-1....0....3....0...-4...-2...-2....3....4...-3....2...-2
.-1....4....2...-1....0...-1...-2...-3....0....0....0....3....0....1...-1....0
..4....1...-1...-3....0...-3....3....4....1....1....2...-3...-4....3...-2....2
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CROSSREFS
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Sequence in context: A063137 A180942 A211447 * A165220 A020218 A217841
Adjacent sequences: A188357 A188358 A188359 * A188361 A188362 A188363
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Mar 28 2011
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STATUS
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approved
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