%I #8 Apr 21 2021 13:12:31
%S 1,6,18,131,905,7582,65134,587682,5416897,50959134,486441796,
%T 4701644087,45911470685
%N Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero.
%C Column 5 of A208825.
%e Some solutions for n=3:
%e .-2...-2...-2...-3...-5...-3...-2...-5...-4...-4....0...-4...-3...-1...-4...-5
%e ..0...-2...-1....0....2...-1....1....1...-1....0....0....2...-2...-1....1....0
%e ..2....4....3....3....3....4....1....4....5....4....0....2....5....2....3....5
%Y Cf. A208825.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 01 2012