A189492 Number of arrangements of n+1 nonzero numbers x(i) in -3..3 with the sum of floor(x(i)/x(i+1)) equal to zero.

6, 38, 152, 928, 4920, 27508, 152358, 852940, 4796962, 27117826, 153988846, 877458110, 5015185460, 28736333450, 165022598514, 949503677434, 5472715411708, 31592116727316, 182623690514234, 1057008913476932

Offset

1,1

Comments

Column 3 of A189498.

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

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

Crossrefs

Cf. A189498.

Sequence in context: A060452 A229620 A045949 * A281803 A288030 A264502

Adjacent sequences: A189489 A189490 A189491 * A189493 A189494 A189495

Keyword

nonn

Author

R. H. Hardin, Apr 23 2011

Status

approved