A190066 Number of arrangements of n+1 nonzero numbers x(i) in -4..4 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

12, 76, 483, 3481, 25306, 191456, 1436962, 10802667, 81709584, 622881909, 4769974211, 36631166224, 282173132213, 2179898773167, 16878487835945, 130935467642770, 1017555976447868, 7920656405513158, 61741451812499715

Offset

1,1

Comments

Column 4 of A190071

Links

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

Example

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

Crossrefs

Sequence in context: A075279 A009405 A009839 * A335253 A071767 A161461

Adjacent sequences: A190063 A190064 A190065 * A190067 A190068 A190069

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved