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 A056349 #6 Aug 22 2017 20:53:09 %S A056349 0,0,1,6,18,55,147,405,1083,2961,8043,22182,61278,170883,477910, %T A056349 1344825,3795750,10757763,30572427,87146139,248991674,713088309, %U A056349 2046303339,5883410760,16944543792,48879708297 %N A056349 Number of primitive (period n) bracelets using exactly three different colored beads. %C A056349 Turning over will not create a new bracelet. %D A056349 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 A056349 sum mu(d)*A056343(n/d) where d|n. %Y A056349 Cf. A056288. %K A056349 nonn %O A056349 1,4 %A A056349 _Marks R. Nester_