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A189550 Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero 1
40, 2000, 31280, 204544, 911144, 3022220, 8655424, 21284040, 47231344, 96369040, 187026380, 335425808, 582302520, 973424372, 1563214444, 2426917164, 3699260196, 5472064152, 7976593144, 11351136420, 15868645560, 21892595476 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A189545

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..145

EXAMPLE

Some solutions for n=5

.-5....1....1....1...-3....1...-3....2....2...-3...-4...-5...-3...-4...-4....2

.-4...-5...-4...-5...-4...-4...-4...-5...-4...-5...-4...-5...-4...-4...-4...-4

..5...-4....4...-2...-3...-4...-5...-2...-2....5....1...-3...-4....2....4....4

..2....3....1....5...-2...-4...-4....3....3....2...-2....2....3....5....5....2

.-1...-5....4....3....1....1...-5...-1....3...-1...-1....4...-1...-4....3...-4

..1....5...-1...-1....2....1....4....2...-1....5....5...-3...-3...-3...-2....4

.-4....5...-1....3...-3....1....5....2...-4....4....5...-4...-1...-3....3....5

CROSSREFS

Sequence in context: A189503 A190076 A278729 * A300116 A060056 A223177

Adjacent sequences:  A189547 A189548 A189549 * A189551 A189552 A189553

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 23 2011

STATUS

approved

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Last modified February 19 12:09 EST 2019. Contains 320310 sequences. (Running on oeis4.)