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A188364 Number of arrangements of 9 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero 0
4671, 173409, 1763151, 10396729, 40629247, 136061137, 355442823, 870473329, 1876439327, 3821007601, 7047842559 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 8 of A188358

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=4

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

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

..0....0....1....1...-4....0....2...-1....0...-4...-1....2....1....1....1....1

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

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

.-2....2....2....4...-4...-4...-2....1...-1....2....0...-2....4...-2....1....4

..2...-3...-4....0....4...-3....2....3....1...-1...-1....0....0...-4....2....0

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

.-1....0....2...-2...-4....2...-1...-4....0....2...-1....4....3...-4....1....2

CROSSREFS

Sequence in context: A062626 A204489 A252127 * A236014 A202431 A066731

Adjacent sequences:  A188361 A188362 A188363 * A188365 A188366 A188367

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2011

STATUS

approved

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Last modified May 24 18:34 EDT 2019. Contains 323534 sequences. (Running on oeis4.)