A189490 Number of arrangements of n+1 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero

0, 12, 152, 3388, 85480, 2642358, 93830584, 3870426602, 179336321514, 9289851475820, 529329739784248, 33294638055400354, 2251636269472534394, 165280305640591105462, 13029806159083867494110, 1097830097296833990293942

Offset

1,2

Comments

Diagonal of A189498

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Sequence in context: A103759 A351526 A121195 * A180808 A004356 A036360

Adjacent sequences: A189487 A189488 A189489 * A189491 A189492 A189493

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved