A190075 Number of arrangements of 6 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, 550, 5136, 25306, 88509, 249119, 599181, 1291797, 2542771, 4665542, 8142317, 13502963, 21463807, 33185295, 49745019, 72458535, 103375585, 144707600, 199040665, 269251217, 358360590, 471257436, 613624162, 789275327, 1002980959

Offset: 1

Author

R. H. Hardin May 04 2011

Keywords

• nonn

Comments

Row 5 of A190071

Examples

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

Links

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