%I #6 Mar 13 2017 00:08:30
%S 1,2,7,38,243,1854,14701,116960,916381,7170239,56496359,449785468,
%T 3619072169
%N Number of n-bead necklaces labeled with numbers -7..7 not allowing reversal, with sum zero and first and second differences in -7..7.
%C Column 7 of A209007.
%e Some solutions for n=6:
%e .-4...-4...-3...-2...-2...-6...-3...-1...-2...-4...-3...-5...-3...-4...-4...-3
%e .-1....1....1...-2...-2...-4....0...-1....1....0...-1....1...-3....2....1....1
%e ..4...-1....1....2...-2....2....0....3....1....4....4....2....1....1....3....2
%e ..2....4....3....0....3....6....1....0....1....4....3....4....1....3....4....1
%e ..0....3...-2....0....2....3....3...-1....0...-2...-1....2....2....1...-2....0
%e .-1...-3....0....2....1...-1...-1....0...-1...-2...-2...-4....2...-3...-2...-1
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 04 2012