A189542 Number of arrangements of n+1 nonzero numbers x(i) in -6..6 with the sum of trunc(x(i)/x(i+1)) equal to zero

60, 264, 2520, 26152, 274132, 3022220, 33638540, 379997096, 4324466328, 49387377504, 566509205348, 6521404038024, 75307822934828, 872056487276532, 10122186382107364, 117736171713864168, 1371964294216603880

Offset

1,1

Comments

Column 6 of A189545

Links

R. H. Hardin, Table of n, a(n) for n = 1..121

Example

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

Crossrefs

Sequence in context: A008428 A206232 A075295 * A134587 A100153 A333966

Adjacent sequences: A189539 A189540 A189541 * A189543 A189544 A189545

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved