A189543 Number of arrangements of n+1 nonzero numbers x(i) in -7..7 with the sum of trunc(x(i)/x(i+1)) equal to zero.

84, 432, 4620, 56440, 683144, 8655424, 111406336, 1456853916, 19269747584, 256327259704, 3425977826592, 45971056435280, 618874800769152, 8355263758869800, 113080150945285296, 1533719330087763556

Offset

1,1

Comments

Column 7 of A189545.

Links

R. H. Hardin, Table of n, a(n) for n = 1..92

Example

Some solutions for n=5
.-7....4...-7...-7...-4...-7...-4...-7...-7...-7....4...-4...-7....4...-4...-4
.-3....2....2...-2...-2...-6....1....4....4....5....2...-4....4....2...-4....2
.-6...-7....6...-5....4...-4....1...-2....7....3....5....7....5...-2....6....7
.-5....7....3....1....4....3...-4....7...-3...-3...-1...-4....3....4....4....6
..4...-4....2....6...-4....2...-2....2...-7...-5....6...-5...-4...-4....3....4
.-2...-6...-7....3....2...-1...-2...-5...-2...-4....2....7...-5....5...-1...-6

Crossrefs

Cf. A189545.

Sequence in context: A227708 A229537 A083986 * A251300 A251293 A251254

Adjacent sequences: A189540 A189541 A189542 * A189544 A189545 A189546

Keyword

nonn

Author

R. H. Hardin, Apr 23 2011

Status

approved