A190077 Number of arrangements of 8 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, 7584, 162028, 1436962, 7843113, 31391655, 101530262, 282859251, 698197690, 1570715217, 3291688243, 6460935664, 12000071771, 21412481203, 36702670681, 60642753250, 97406905547, 152416471950, 232926480058, 348492673798

Offset

1,2

Comments

Row 7 of A190071

Links

R. H. Hardin, Table of n, a(n) for n = 1..81

Example

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

Crossrefs

Sequence in context: A028539 A355119 A234204 * A233881 A031854 A253041

Adjacent sequences: A190074 A190075 A190076 * A190078 A190079 A190080

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved