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 A208669 Number of 2n-bead necklaces labelled with numbers 1..6 allowing reversal, with neighbors differing by exactly 1 0
 5, 9, 16, 32, 65, 152, 360, 937, 2512, 7034, 20124, 58899, 174408, 522453, 1576468 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A208671 LINKS EXAMPLE All solutions for n=3 ..3....5....2....3....3....2....4....4....2....1....1....2....1....3....4....1 ..4....6....3....4....4....3....5....5....3....2....2....3....2....4....5....2 ..5....5....2....3....3....4....4....4....4....1....3....2....3....5....6....1 ..6....6....3....4....4....3....5....5....5....2....4....3....2....4....5....2 ..5....5....4....5....3....4....6....4....4....1....3....2....3....5....6....3 ..4....6....3....4....4....3....5....5....3....2....2....3....2....4....5....2 CROSSREFS Sequence in context: A090990 A088495 A218611 * A062777 A215331 A208725 Adjacent sequences:  A208666 A208667 A208668 * A208670 A208671 A208672 KEYWORD nonn AUTHOR R. H. Hardin Feb 29 2012 STATUS approved

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