A189950 1/4 the number of arrangements of n+1 nonzero numbers x(i) in -8..8 with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero

20, 103, 1350, 22220, 327880, 4678100, 68081570, 1012894742, 15245829657, 230937539015, 3515809056902, 53766069905706, 825394005427540, 12711935460761503, 196311914160978767, 3038824326513268799

Offset

1,1

Comments

Column 8 of A189951

Links

R. H. Hardin, Table of n, a(n) for n = 1..65

Example

Some solutions with n=3
.-6...-6...-5....7....1...-2...-3....7...-6....7....3....6....1....7...-2....5
.-6...-5....2...-2....4....8....2....3...-1....2...-5...-3....4...-1....8....2
.-1....2....1...-1...-5...-6...-5...-4....6...-3....7....8...-5....6...-6...-1
..1....7...-3....2...-6....1....4...-5...-5...-4....5....5...-8....5...-3....3

Crossrefs

Sequence in context: A071334 A241355 A220207 * A045768 A088831 A063785

Adjacent sequences: A189947 A189948 A189949 * A189951 A189952 A189953

Keyword

nonn

Author

R. H. Hardin May 02 2011

Status

approved