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 A056301 #13 Sep 03 2018 15:37:25
%S A056301 1,1,2,5,11,38,122,496,2005,8707,38364,173562,792827,3662800,17034367,
%T A056301 79702578,374624253,1767881397,8370666416,39751064122,189262621739,
%U A056301 903220020390,4319518316898,20697040024784
%N A056301 Number of primitive (period n) n-bead necklace structures using a maximum of five different colored beads.
%C A056301 Turning over the necklace is not allowed. Colors may be permuted without changing the necklace structure.
%D A056301 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 A056301 a(n) = Sum_{d|n} mu(d) * A056293(n/d); mu = A008683.
%Y A056301 Cf. A001692, A008683.
%K A056301 nonn
%O A056301 1,3
%A A056301 _Marks R. Nester_