A190065 Number of arrangements of n+1 nonzero numbers x(i) in -3..3 with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero

6, 36, 166, 922, 5136, 28656, 162028, 910716, 5162308, 29554964, 169886511, 978214225, 5650347932, 32745824773, 190185910978, 1106505067832, 6449387884888, 37654438607875, 220148079884339, 1288689800220653

Offset

1,1

Comments

Column 3 of A190071

Links

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

Example

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

Crossrefs

Sequence in context: A203050 A203332 A351783 * A293068 A213294 A293886

Adjacent sequences: A190062 A190063 A190064 * A190066 A190067 A190068

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved