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A188355 Number of arrangements of n+1 numbers x(i) in -6..6 with the sum of x(i)*x(i+1) equal to zero. 1
25, 325, 1205, 14477, 100885, 1171345, 11535493, 136061137, 1540834589, 18592832393, 222616829157, 2732659664405, 33554957179729, 416689678586229, 5184974750699645, 64895937068447245, 813946908435419257 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A188358.
LINKS
EXAMPLE
Some solutions for n=4
..2...-3....1...-1...-6...-1....3...-6....1....2...-4...-3....1...-4....0...-2
..0...-2...-5....3...-2....0....5....1...-2...-1....0...-5....4...-1....1...-6
..6...-3...-1....3....6....2...-3....2...-3...-3...-5....3...-4....4....0...-1
..0....6....5....6...-6...-2....0....1....1...-1....4....0....6....0...-1....6
.-5....1....1...-4...-6...-2....4....2...-1....4....5...-3....6...-2....0...-2
CROSSREFS
Cf. A188358.
Sequence in context: A000448 A000446 A124980 * A243089 A079875 A162702
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 28 2011
STATUS
approved

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Last modified March 28 15:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)