A189552 Number of arrangements of 9 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero

140, 28440, 977092, 11544464, 80270588, 379997096, 1456853916, 4628970120, 12936888748, 32366459464, 75421739904, 160238955844, 324918108616, 626280932600, 1150395462428, 2026063806864, 3474982794008, 5750861887452

Offset

1,1

Comments

Row 8 of A189545

Links

R. H. Hardin, Table of n, a(n) for n = 1..61

Example

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

Crossrefs

Sequence in context: A189505 A190078 A091755 * A181238 A211420 A185402

Adjacent sequences: A189549 A189550 A189551 * A189553 A189554 A189555

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved