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

1,2

Comments

Row 5 of A190071

Links

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

Example

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

Crossrefs

Sequence in context: A141547 A236723 A189502 * A234415 A285925 A285861

Adjacent sequences: A190072 A190073 A190074 * A190076 A190077 A190078

Keyword

nonn

Author

R. H. Hardin May 04 2011

Status

approved