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A189954 1/4 the number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero 1
8, 72, 384, 1246, 3247, 6733, 13034, 22220, 36293, 55724, 82485, 116630, 162360, 219198, 290165, 376419, 481243, 606253, 754108, 927521, 1130575, 1364106, 1631281, 1935163, 2280562, 2673957, 3110403, 3602734, 4147102, 4757233, 5423413 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A189951

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions with n=3

..1....1....2....1....1...-2....3....2....1....1....3....3....3...-3....2....3

.-2....2....1...-3....3....1...-3...-2...-3....1...-2....1....1...-3....2...-3

.-1...-1...-3...-1...-2....3....1...-2...-2...-3...-1...-2....1....3....2....1

.-2....3...-3...-2....3...-1...-1....1....1...-1...-3...-1...-1....3...-2...-3

.-2....1....2....2....1...-3....1....1...-1...-3....3...-3...-1...-3....2...-2

CROSSREFS

Sequence in context: A254371 A143945 A239095 * A271028 A180288 A082141

Adjacent sequences:  A189951 A189952 A189953 * A189955 A189956 A189957

KEYWORD

nonn

AUTHOR

R. H. Hardin May 02 2011

STATUS

approved

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Last modified July 17 23:21 EDT 2019. Contains 325109 sequences. (Running on oeis4.)