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A188256 Number of arrangements of 10 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero 0
0, 57808, 1657632, 20265640, 123729664, 591604824, 2026547348, 6250275112, 16132348896, 38938013924 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 8 of A188249

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

.-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4

.-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4...-4

..1....1...-2...-1...-1....1...-2...-2...-2....1....1....1...-1...-1....1...-2

.-1...-4....1...-4...-4....2....4....4....2...-1...-3...-3....3...-4...-4...-2

.-1...-4...-4....4...-3...-1....3...-3...-2...-2...-2...-3...-3....2....4....4

..1...-3....2...-3....3...-4...-4....2....2...-3...-1...-1....2....4...-1...-3

.-1....4....1...-4...-1....4...-1...-3...-3....1...-1....3...-4...-3...-4....1

.-2...-3....3....2....4....1...-4...-4....4...-4....2....2...-2...-3...-3...-2

..3....2...-3....3...-4...-2....4....2....3....2...-4...-4....2....3...-4....3

.-2...-3....2...-2....1....1...-2....2...-2...-2....2....4....1...-4....4....1

CROSSREFS

Sequence in context: A166195 A031861 A119887 * A124729 A184372 A237402

Adjacent sequences:  A188253 A188254 A188255 * A188257 A188258 A188259

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 25 2011

STATUS

approved

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Last modified May 9 20:59 EDT 2021. Contains 343746 sequences. (Running on oeis4.)