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%I #6 Mar 12 2017 23:18:41
%S 1,7,25,210,1755,17339,177097,1888153,20587627,228891069,2582512649,
%T 29499246456
%N Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero.
%C Column 6 of A208825.
%e Some solutions for n=3:
%e .-4...-5...-4...-6...-5...-2...-1...-3...-6...-1...-3...-6...-4...-2...-6...-4
%e .-2....1....0....3...-1...-1....0...-1....1...-1....1....0...-1...-2....2....2
%e ..6....4....4....3....6....3....1....4....5....2....2....6....5....4....4....2
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 01 2012