This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A056300 #14 Sep 03 2018 15:42:08
%S A056300 1,1,2,5,10,35,102,360,1232,4427,15934,58465,215250,799593,2983204,
%T A056300 11187200,42109450,159081482,602809326,2290679807,8726308212,
%U A056300 33318645341,127479700198,488672244040,1876500180280
%N A056300 Number of primitive (period n) n-bead necklace structures using a maximum of four different colored beads.
%C A056300 Turning over the necklace is not allowed. Colors may be permuted without changing the necklace structure.
%D A056300 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 A056300 a(n) = Sum_{d|n} mu(d) * A056292(n/d); mu = A008683.
%Y A056300 Cf. A008683, A027377, A056292.
%K A056300 nonn
%O A056300 1,3
%A A056300 _Marks R. Nester_