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 A209065 Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2. 0
 1, 3, 12, 122, 1722, 33469, 817594, 24194286, 841661871, 33691654098 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A209073. LINKS EXAMPLE Some solutions for n=6: .-6...-4...-6...-6...-5...-6...-6...-6...-6...-6...-6...-5...-3...-5...-3...-6 .-1....3...-3....4...-4...-5....1...-1....1...-4...-5....5....0....2...-2...-4 ..6....2....3....5....3....2....0....5...-1...-3....4....1....2...-4....1....6 .-3...-1...-2...-2....6....5...-1....4....6....3....4....6....1...-2...-2....1 ..1....0....2....2....4...-2....6....3....3....4....0...-3....2....3....3....0 ..3....0....6...-3...-4....6....0...-5...-3....6....3...-4...-2....6....3....3 CROSSREFS Sequence in context: A280248 A067124 A208937 * A124153 A162127 A073987 Adjacent sequences:  A209062 A209063 A209064 * A209066 A209067 A209068 KEYWORD nonn AUTHOR R. H. Hardin, Mar 04 2012 STATUS approved

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Last modified May 27 07:25 EDT 2022. Contains 354093 sequences. (Running on oeis4.)