A189544 Number of arrangements of n+1 nonzero numbers x(i) in -8..8 with the sum of trunc(x(i)/x(i+1)) equal to zero

112, 660, 7716, 107464, 1481908, 21284040, 311438060, 4628970120, 69656466100, 1056054983348, 16103559487552, 246657108114908, 3791540831400220, 58459686887550560, 903694350477338140, 14001035809162949776

Offset

1,1

Comments

Column 8 of A189545

Links

R. H. Hardin, Table of n, a(n) for n = 1..79

Example

Some solutions for n=5
.-8...-8...-5...-8...-7...-8...-8...-6...-5...-7...-7...-7...-8...-8...-7...-8
.-4...-4...-8...-7...-5...-7...-5...-7...-8...-8...-6...-6...-7...-7...-6...-5
..7...-6...-6....3....2....1....2....1...-5...-3...-6....7...-2...-8....6...-7
.-8...-8...-7...-3....2....6....5...-3....2....3....2....5....5....3....3....2
..7....3....6...-1....6....1...-4....7...-8....6....5....8....5....2....4...-6
.-5...-5....7....1...-7....8...-2....1...-6...-4....4...-4...-1....8...-2...-3

Crossrefs

Sequence in context: A217992 A221798 A340574 * A154063 A205250 A047631

Adjacent sequences: A189541 A189542 A189543 * A189545 A189546 A189547

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved