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 A056350 #6 Aug 22 2017 20:53:09 %S A056350 0,0,0,3,24,136,612,2616,10480,41364,159780,613919,2341920,8919204, %T A056350 33905164,128904660,490213680,1866117224,7111777860,27140327757, %U A056350 103721217388,396974621676,1521577377012,5840546872280 %N A056350 Number of primitive (period n) bracelets using exactly four different colored beads. %C A056350 Turning over will not create a new bracelet. %D A056350 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 A056350 Sum mu(d)*A056344(n/d) where d|n. %Y A056350 Cf. A056289. %K A056350 nonn %O A056350 1,4 %A A056350 _Marks R. Nester_