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 A209109 Number of n-bead necklaces labeled with numbers -2..2 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2. 0
 1, 3, 5, 22, 63, 238, 865, 3417, 13607, 55669, 230581, 968550, 4108547, 17589348, 75872175, 329480644, 1439151627, 6318822750, 27872030921, 123452835089 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A209115. LINKS EXAMPLE Some solutions for n=6: .-2...-1...-2...-2...-2...-2...-2...-1...-2...-2...-2...-2...-2...-1...-2...-2 ..2....0...-2...-1....0....0....1...-1....1....0....0....0....2....0....0....2 ..2....0....2....2....2...-1...-1...-1...-1...-1....2...-2....0...-1....0...-2 .-1...-1....1....2....0....0....1....1...-1...-1....1....2...-1....1....0....2 .-1....0....2...-1....1....2....2....2....1....2...-1....0....1...-1....1...-1 ..0....2...-1....0...-1....1...-1....0....2....2....0....2....0....2....1....1 CROSSREFS Sequence in context: A025117 A318076 A124423 * A212260 A178377 A270621 Adjacent sequences:  A209106 A209107 A209108 * A209110 A209111 A209112 KEYWORD nonn AUTHOR R. H. Hardin, Mar 05 2012 STATUS approved

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Last modified August 10 20:21 EDT 2022. Contains 356039 sequences. (Running on oeis4.)