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 A208988 Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and first differences in -3..3. 0
 1, 2, 5, 16, 59, 253, 1111, 5067, 23483, 110772, 529201, 2557073, 12471501, 61328336, 303723367, 1513583006, 7584498891, 38192683192, 193171464383, 980903632155 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A208993. LINKS EXAMPLE Some solutions for n=6: .-1...-1...-3...-2...-1...-3...-2...-2...-2...-2...-2...-2...-2....0...-2...-3 .-1...-1....0...-1....0....0....1....1...-2....1....0...-1...-2....0....0....0 .-1....0....2....0....0...-1....0...-1....1....1...-1....1....0....0....1....2 ..2....0....2....2...-1....2....1...-1....1...-1....2....3....3....0....0....0 .-1....0....1....0....0....2...-1....2....1....1....1....0....1....0....0....1 ..2....2...-2....1....2....0....1....1....1....0....0...-1....0....0....1....0 CROSSREFS Sequence in context: A087949 A028333 A007747 * A107283 A059237 A104547 Adjacent sequences:  A208985 A208986 A208987 * A208989 A208990 A208991 KEYWORD nonn AUTHOR R. H. Hardin, Mar 04 2012 STATUS approved

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Last modified May 21 01:01 EDT 2019. Contains 323429 sequences. (Running on oeis4.)