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%I #7 Mar 12 2017 23:21:19
%S 1,3,12,122,1722,33468,817362,24184890,841286276,33675904820,
%T 1525641905390
%N Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero with no three beads in a row equal.
%C Diagonal of A208945.
%e Some solutions for n=5:
%e .-2...-4...-4...-5...-5...-5...-4...-3...-5...-1...-4...-4...-5...-4...-4...-5
%e .-2....0....5....0....1....0....1....4....0...-1...-4....4....3....5....0...-1
%e .-1...-1...-2....4....0...-2....1...-1...-3....2....1....1....0...-3....5....5
%e ..2....4....1...-3....0....2....4...-2....5....0....2...-2....5....3...-3....4
%e ..3....1....0....4....4....5...-2....2....3....0....5....1...-3...-1....2...-3
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 03 2012