A189495 Number of arrangements of n+1 nonzero numbers x(i) in -6..6 with the sum of floor(x(i)/x(i+1)) equal to zero

30, 240, 2128, 22088, 238836, 2642358, 29261538, 326423068, 3664621084, 41363200538, 468946573672, 5336062742740, 60905410016682, 697014919372024, 7995252612136370, 91897595260805282, 1058172169719093028

Offset

1,1

Comments

Column 6 of A189498

Links

R. H. Hardin, Table of n, a(n) for n = 1..107

Example

Some solutions for n=5
..6....2...-6....2....6....2...-3....2...-3...-4...-3....2....4....2...-1...-3
..2....2...-6....2...-4....2...-4....2...-5...-6...-6...-5...-4....1...-6....1
..5...-4...-2...-2...-1....3...-3....4....2...-6...-3...-3...-2....3...-4....6
.-3...-2....2...-4...-3...-4....2....3....2....4...-3....2....2....2....5....3
..3....3...-4....6...-5...-2....1...-2....1....4....1...-6...-4...-1...-4....2
..5...-4....2....5....4....1...-4...-4....6....5....5...-2...-3....2...-2....6

Crossrefs

Sequence in context: A069487 A008385 A061167 * A138404 A136381 A042752

Adjacent sequences: A189492 A189493 A189494 * A189496 A189497 A189498

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved