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A189946 1/4 the number of arrangements of n+1 nonzero numbers x(i) in -4..4 with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero 1
8, 29, 159, 1246, 9884, 73992, 542353, 4014514, 30195535, 229483051, 1753032755, 13435104833, 103277494510, 796249956004, 6155156882177, 47687937106356, 370185895527595, 2878540976279306, 22417566580905998, 174824418896006501 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A189951

LINKS

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

EXAMPLE

Some solutions with n=3

..1....3...-4....2...-2...-1....4...-1....2....4...-3....1....1....4...-4...-1

.-1....1....4....2...-1....3...-2...-3....2...-4....2...-2....3...-2....3....3

.-1...-4....4....1...-1....2....1....3....2....2....1...-1...-2....2....3....1

..1...-3....2....1...-1...-1....1....2...-2....1....4...-2....4....1....2...-2

CROSSREFS

Sequence in context: A088131 A072264 A110527 * A239855 A239029 A071931

Adjacent sequences:  A189943 A189944 A189945 * A189947 A189948 A189949

KEYWORD

nonn

AUTHOR

R. H. Hardin May 02 2011

STATUS

approved

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Last modified February 22 01:36 EST 2019. Contains 320381 sequences. (Running on oeis4.)