A189504 Number of arrangements of 8 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero

0, 7384, 152358, 1350418, 7250142, 29261538, 93830584, 260746932, 640437244, 1434950142, 2985187290, 5855131794, 10847051914, 19293465580, 33015900952, 54518107984, 87418596734, 136633143572, 208413957692, 311534423834

Offset

1,2

Comments

Row 7 of A189498

Links

R. H. Hardin, Table of n, a(n) for n = 1..90

Example

Some solutions for n=5
.-5...-4...-5...-5...-5...-5...-5...-4...-5...-5...-5...-4...-5...-5...-4...-5
.-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5
..2...-4....5...-3...-4...-2...-3...-3...-5...-2...-4...-4....2...-2...-5...-5
.-4....4....5....3....5....3...-4...-4....1...-5....3....3....1...-4....2...-4
.-2...-5....3...-4....1...-5....2...-1....4....5....1....2....1...-2...-2...-4
..4...-2....5....3...-1...-2....5....5....3...-3...-4...-1...-2....5...-1...-4
..5....1...-5....3....4....1....4...-2....1....4....5...-5...-3...-5...-2....4
..2....1....5....2...-1...-4...-4....5...-1....4...-5...-2...-5....2...-2...-1

Crossrefs

Sequence in context: A277286 A328663 A022255 * A028540 A347164 A206202

Adjacent sequences: A189501 A189502 A189503 * A189505 A189506 A189507

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved