cp's OEIS Frontend

A209030 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and first differences in -6..6.

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