A189549 Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero

0, 552, 5416, 26804, 97836, 274132, 683144, 1481908, 2937048, 5414876, 9605792, 15831096, 25469448, 39609448, 59492044, 86819652, 124912364, 174698948, 241615316, 327281004, 436632904, 575430892, 752423588, 965700832, 1230962864

Offset

1,2

Comments

Row 5 of A189545

Links

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

Example

Some solutions for n=5
.-3....3...-3....1....2...-5....2...-1...-4...-5...-5....2...-4...-3....1...-1
.-1....5....3....1...-4....5....1....4...-1...-5...-5....2....2....2...-3...-2
.-1....1....4...-3....4....4...-3...-2...-3...-2...-4...-2...-1...-2....4....2
.-5...-4...-3....2....2...-5...-4....5...-4....3....2...-3....4....5...-3...-5
.-5....5...-4...-3....5....3...-3....5....1...-1...-3....2....1....5...-5...-4
..1...-1...-2...-5...-4....2....1....4...-5...-5....4....2...-4....3...-4...-5

Crossrefs

Sequence in context: A014360 A158636 A251161 * A282595 A290048 A023914

Adjacent sequences: A189546 A189547 A189548 * A189550 A189551 A189552

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved