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Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero.
0

%I #6 Mar 12 2017 23:17:05

%S 1,4,8,38,155,828,4390,25202,146803,878708,5330524,32785934,203687695,

%T 1276913732,8065359582,51282069040

%N Number of n-bead necklaces labeled with numbers -3..3 allowing reversal, with sum zero.

%C Column 3 of A208825.

%e All solutions for n=3:

%e .-2....0...-2...-3...-1...-3...-1...-2

%e .-1....0....1....1...-1....0....0....0

%e ..3....0....1....2....2....3....1....2

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 01 2012