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 A056307 #10 Aug 22 2017 20:53:08 %S A056307 0,0,0,0,0,1,3,36,296,2303,16317,110461,717024,4532102,28046285, %T A056307 170938778,1029749994,6149327608,36477979041,215304156613, %U A056307 1265984738261,7422971215512,43433472086235,253759842112792 %N A056307 Number of primitive (period n) n-bead necklace structures using exactly six different colored beads. %C A056307 Turning over the necklace is not allowed. Colors may be permuted without changing the necklace structure. %D A056307 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 A056307 Sum mu(d)*A056299(n/d) where d|n. Alternatively, A056302(n)-A056301(n).. %Y A056307 Column 6 of A107424. %Y A056307 Cf. A056291. %K A056307 nonn %O A056307 1,7 %A A056307 _Marks R. Nester_