A190063 Number of arrangements of n+1 nonzero numbers x(i) in -n..n 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

0, 12, 166, 3481, 88509, 2783714, 101530262, 4232955454, 198636188057, 10408538943146, 603033909983829, 38103929980500423, 2608648993698684772, 193359775333060165517, 15364574547397697984616, 1301880431718317296701496

Offset

1,2

Comments

Diagonal of A190071

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Sequence in context: A055760 A056591 A331497 * A160566 A324414 A099745

Adjacent sequences: A190060 A190061 A190062 * A190064 A190065 A190066

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved