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%I #14 Mar 18 2018 17:53:51
%S 1,4,10,60,358,2798,22249,186765,1596162,13907330,122758794,
%T 1096122478,9880366438,89796245827,821927851286,7570508171686,
%U 70115797179348,652594351781036,6100765243003922,57259681174637899,539353919732122101,5097036850039818860
%N Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and first differences in -6..6.
%H Andrew Howroyd, <a href="/A209030/b209030.txt">Table of n, a(n) for n = 1..50</a>
%e Some solutions for n=6:
%e -3 -6 -4 -4 -2 -3 -3 -3 -4 -6 -3 -3 -2 -4 -5 -5
%e -1 -1 -3 -3 0 -2 1 0 1 -4 -2 -1 -1 -3 1 -5
%e 4 -1 0 2 1 2 3 -2 -3 2 2 4 2 2 -4 0
%e -2 3 5 3 -1 -1 -1 1 0 3 2 -1 0 3 2 5
%e 0 5 4 4 0 1 -2 2 5 5 2 -1 0 0 5 4
%e 2 0 -2 -2 2 3 2 2 1 0 -1 2 1 2 1 1
%Y Column 6 of A209032.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 04 2012
%E a(14)-a(22) from _Andrew Howroyd_, Mar 12 2017
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