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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

(list; graph; refs; listen; history; text; internal format)

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