A056367 - OEIS

%I #9 Aug 22 2017 20:53:09

%S 0,0,1,2,5,13,31,80,201,533,1401,3822,10395,28859,80201,225286,634265,

%T 1796433,5100325,14534758,41513402,118879249,341094843,980661980,

%U 2824223490,8146897815,23535345170

%N Number of primitive (period n) bracelet structures using exactly three 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 A056362(n)-A000046(n).

%Y Column 3 of A276543.

%Y Cf. A056304.

%K nonn

%O 1,4

%A _Marks R. Nester_