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%I #9 Aug 22 2017 20:53:09
%S 0,0,0,1,2,11,33,136,478,1849,6845,26136,98406,373977,1416249,5380770,
%T 20440250,77794939,296384565,1131009781,4321964735,16541268223,
%U 63400061153,243358777620,935431121460,3600520732809
%N Number of primitive (period n) bracelet structures using exactly four different colored beads.
%C Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure.
%D M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
%F A056363(n)-A056362(n).
%Y Column 4 of A276543.
%Y Cf. A056305.
%K nonn
%O 1,5
%A _Marks R. Nester_