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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 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 A345565 A345820 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 February 1 07:08 EST 2023. Contains 359981 sequences. (Running on oeis4.)