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%I #12 Mar 12 2017 22:43:46
%S 1,1,2,3,3,15,22,38,147,296,526,2421,5017,10025,43986,96951,202141,
%T 880269,1993222,4317765,18453137,42777491,95192956,400944526,
%U 946008489,2151685046,8941940220,21409059701,49569448411,203582329338,493419056384,1159647133954
%N Number of n-bead necklaces labeled with numbers -1..1 allowing reversal, with sum zero and three times sum of squares <= n*(1)*(1+1).
%H Andrew Howroyd, <a href="/A208798/b208798.txt">Table of n, a(n) for n = 1..100</a>
%e All solutions for n=6:
%e .-1...-1...-1...-1...-1...-1...-1...-1...-1....0...-1...-1...-1...-1...-1
%e .-1....0....0....0....0....0....0....0...-1....0...-1....0...-1....0....0
%e ..0....0....0....0...-1....1...-1....0....1....0....0....1....0....1....0
%e ..0....0....0....1....1....0....0....1....0....0....1...-1....1...-1...-1
%e ..1....1....0....0....0...-1....1...-1....0....0....0....1....1....0....1
%e ..1....0....1....0....1....1....1....1....1....0....1....0....0....1....1
%Y Column 1 of A208805.
%K nonn
%O 1,3
%A _R. H. Hardin_, Mar 01 2012
%E a(29)-a(32) from _Andrew Howroyd_, Mar 02 2017
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