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A189956 1/4 the number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero 1
32, 1152, 13569, 73992, 280284, 839968, 2095080, 4678100, 9483181, 17859030, 31526421, 53335818, 86113621, 134395470, 203331437, 299865250, 431183908, 608327784, 840894817, 1144932377, 1534996553, 2030482093, 2648947079 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 6 of A189951
LINKS
EXAMPLE
Some solutions with n=3
..2...-1....1...-2...-3....1...-1...-2....1...-2....1...-3...-1...-3...-3...-1
.-3...-2...-2....2...-1...-1....2...-2...-2...-2...-3....3...-2...-1....3....1
..2....2...-1...-1....1...-3...-1....2....2....1....2...-1...-1....2....1....2
.-2...-3...-1...-3....2....2....1....2....2....3....1...-1....3....2....1...-1
..2...-1...-1....1...-2....3...-1...-2...-1...-1....3....2...-2...-1...-3....3
.-1...-2...-3....3...-1...-1....1....2....2...-1...-3....1....1....1...-1....3
..3...-2....3....1....3....1....2...-1...-2...-2....2....3...-2...-2...-2....3
CROSSREFS
Sequence in context: A038097 A208267 A184758 * A318014 A320400 A367538
KEYWORD
nonn
AUTHOR
R. H. Hardin May 02 2011
STATUS
approved

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Last modified April 20 04:18 EDT 2024. Contains 371798 sequences. (Running on oeis4.)