A190078 Number of arrangements of 9 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

140, 27328, 910716, 10802667, 73725405, 353856100, 1333341624, 4232955454, 11720735320, 29213945353, 67119317038, 143366487211, 287901954546, 552087286271, 1012169804786, 1781377206624, 3036183971866, 5024176668242

Offset

1,1

Comments

Row 8 of A190071

Links

R. H. Hardin, Table of n, a(n) for n = 1..58

Example

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

Crossrefs

Sequence in context: A188255 A159366 A189505 * A091755 A189552 A181238

Adjacent sequences: A190075 A190076 A190077 * A190079 A190080 A190081

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved