A189537 Number of arrangements of n+1 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero

0, 8, 192, 3664, 97836, 3022220, 111406336, 4628970120, 218096627156, 11386607289752, 663503578718392, 41531582314206828, 2853359963095951888, 211159586315457308624, 16744498622418072268632, 1413898875545606092572904

Offset

1,2

Comments

Diagonal of A189545

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

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

Crossrefs

Sequence in context: A129004 A267948 A339487 * A268095 A058873 A052734

Adjacent sequences: A189534 A189535 A189536 * A189538 A189539 A189540

Keyword

nonn

Author

R. H. Hardin Apr 23 2011

Status

approved