%I #7 Mar 12 2017 23:15:33
%S 1,3,8,75,905,17339,417204,12322101,427919519,17112239947,774546254686
%N Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.
%C Diagonal of A208825.
%e All solutions for n=3:
%e .-2....0...-3...-3...-2...-1...-2...-1
%e .-1....0....0....1....0...-1....1....0
%e ..3....0....3....2....2....2....1....1
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 01 2012
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