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

40, 2000, 31280, 204544, 911144, 3022220, 8655424, 21284040, 47231344, 96369040, 187026380, 335425808, 582302520, 973424372, 1563214444, 2426917164, 3699260196, 5472064152, 7976593144, 11351136420, 15868645560, 21892595476

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