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 A056348 #6 Aug 22 2017 20:53:09 %S A056348 0,1,2,3,6,8,16,24,42,69,124,208,378,668,1214,2220,4110,7630,14308, %T A056348 26931,50944,96782,184408,352450,675180,1296477,2493680,4805388, %U A056348 9272778,17919558,34669600 %N A056348 Number of primitive (period n) bracelets using exactly two different colored beads. %C A056348 Turning over will not create a new bracelet. Identical to A001371 for n>1. %D A056348 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 A056348 Sum mu(d)*A056342(n/d) where d divides n. %Y A056348 Cf. A001037. %K A056348 nonn %O A056348 1,3 %A A056348 _Marks R. Nester_