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%I #7 Mar 12 2017 23:51:21
%S 1,3,7,72,883,16968,409199,12099880,420661470,16838275108,762821788869
%N Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero with no three beads in a row equal.
%C Diagonal of A209344.
%e Some solutions for n=6:
%e .-4...-5...-6...-4...-6...-5...-5...-5...-5...-5...-3...-5...-5...-6...-6...-5
%e .-3...-4....5....2...-4....3....3....0...-4....0...-2...-3....1...-3....0....0
%e ..6....5...-4....3....6...-3...-1....2...-4...-3...-1....1....2....2....3....0
%e ..0....0...-5...-3....3....0...-3...-2....6....3....0...-2...-4....1....3...-1
%e ..0....2....4...-1....1....1....2...-1....4....0....5....5....0....0...-4....1
%e ..1....2....6....3....0....4....4....6....3....5....1....4....6....6....4....5
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 06 2012
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