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%I #6 Mar 13 2017 00:21:12
%S 1,2,2,11,40,221,1185,6883,39143,224991,1299553,7598452,44893012,
%T 267934513
%N Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and first and second differences in -5..5.
%C Column 5 of A208970.
%e Some solutions for n=5:
%e .-1...-2...-1...-2...-1...-2...-1...-3...-2...-2...-3....0...-2...-2...-2...-3
%e ..0...-1...-1....0...-1...-2...-1...-1....0....0...-2....0...-1...-2...-1...-2
%e .-1....2....0....2....1...-2....0....2....0....1....1....0...-1....1....1....2
%e ..1....1....2...-1....0....3....0....2....2....1....3....0....2....1....2....2
%e ..1....0....0....1....1....3....2....0....0....0....1....0....2....2....0....1
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 03 2012