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A209342 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero with no three beads in a row equal. 0

%I

%S 1,7,24,205,1724,16968,172610,1830872,19860306,219630346,2464760150,

%T 28002352120

%N Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero with no three beads in a row equal.

%C Column 6 of A209344.

%e Some solutions for n=6:

%e .-5...-5...-5...-3...-6...-4...-6...-6...-6...-4...-4...-5...-5...-6...-5...-6

%e ..0...-2....3....3....3...-2...-6....5....3...-3...-1...-2...-5...-1...-4....4

%e ..2....1...-4...-3...-5....6....2...-6....5....1....1...-2....3....4....6...-5

%e .-3...-2....4....3....2...-4....3....5...-5....3....4....5....2....4....6....6

%e ..2....3...-2...-3....3....3....2...-3...-1....0....0....2....0...-3...-5...-5

%e ..4....5....4....3....3....1....5....5....4....3....0....2....5....2....2....6

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 06 2012

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Last modified September 18 04:22 EDT 2021. Contains 347508 sequences. (Running on oeis4.)