%I
%S 0,0,2,9,30,91,258,729,2018,5613,15546,43315,120750,338259,950062,
%T 2678499,7573350,21480739,61088874,174184755,497812638,1425847623,
%U 4092087522,11765822365,33887517870,97756387365,282414624746,816999710223,2366509198350,6862930841141
%N Number of nbead necklaces with exactly three different colored beads.
%C Turning over the necklace is not allowed.
%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]
%H Alois P. Heinz, <a href="/A056283/b056283.txt">Table of n, a(n) for n = 1..1000</a>
%F A001867(n)3*A000031(n)+3.
%Y Cf. A001867, A052823.
%Y Column k=3 of A087854.
%K nonn
%O 1,3
%A _Marks R. Nester_
