A189505 Number of arrangements of 9 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero

140, 26816, 852940, 10077438, 67449574, 326423068, 1218634086, 3870426602, 10678039872, 26541186546, 60515390904, 129217908546, 258501393812, 493822993858, 903540678414, 1589111278140, 2702453254684, 4467233004764

Offset

1,1

Comments

Row 8 of A189498

Links

R. H. Hardin, Table of n, a(n) for n = 1..58

Example

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

Crossrefs

Sequence in context: A159362 A188255 A159366 * A190078 A091755 A189552

Adjacent sequences: A189502 A189503 A189504 * A189506 A189507 A189508

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved