A189947 1/4 the number of arrangements of n+1 nonzero numbers x(i) in -5..5 with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero

10, 39, 306, 3247, 31284, 280284, 2514945, 23257218, 219695998, 2090461716, 19931671853, 190527865384, 1828012347661, 17602780129116, 169999647974922, 1645503998030853, 15958170796668622, 155032669862412399

Offset

1,1

Comments

Column 5 of A189951

Links

R. H. Hardin, Table of n, a(n) for n = 1..189

Example

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

Crossrefs

Sequence in context: A055514 A055233 A267626 * A370792 A197705 A306413

Adjacent sequences: A189944 A189945 A189946 * A189948 A189949 A189950

Keyword

nonn

Author

R. H. Hardin May 02 2011

Status

approved