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 A209071 Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2. 0
 1, 7, 42, 366, 3378, 33469, 344618, 3660116, 39772437, 440146892, 4943305065, 56200679500, 645543627296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 6 of A209073. LINKS EXAMPLE Some solutions for n=6: .-4...-5...-3...-5...-6...-5...-4...-6...-5...-4...-5...-6...-4...-5...-4...-1 .-2....4....5...-3....3....5....6....1....1....4....1...-6....0...-3....3....0 .-2....6....2....5...-3...-2...-2...-4...-1....1....4....6...-4....4...-3....0 ..4...-4...-1....2....4....4....0....0...-2....4...-3...-6....6....2....1....1 ..2...-2...-1....4....1...-4...-2....4....5...-2....5....6...-2....6....3...-1 ..2....1...-2...-3....1....2....2....5....2...-3...-2....6....4...-4....0....1 CROSSREFS Sequence in context: A218124 A048862 A208943 * A174224 A278571 A133669 Adjacent sequences:  A209068 A209069 A209070 * A209072 A209073 A209074 KEYWORD nonn AUTHOR R. H. Hardin, Mar 04 2012 STATUS approved

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Last modified May 16 18:07 EDT 2022. Contains 353719 sequences. (Running on oeis4.)