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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 1
0, 8, 192, 3664, 97836, 3022220, 111406336, 4628970120, 218096627156, 11386607289752, 663503578718392, 41531582314206828, 2853359963095951888, 211159586315457308624, 16744498622418072268632, 1413898875545606092572904 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 18 03:55 EDT 2021. Contains 347505 sequences. (Running on oeis4.)