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 A056306 #10 Aug 22 2017 20:53:08 %S A056306 0,0,0,0,1,3,20,136,773,4280,22430,115097,577577,2863207,14051163, %T A056306 68515378,332514803,1608799915,7767857090,37460384315,180536313527, %U A056306 869901375049,4192038616700,20208367780744 %N A056306 Number of primitive (period n) n-bead necklace structures using exactly five different colored beads. %C A056306 Turning over the necklace is not allowed. Colors may be permuted without changing the necklace structure. %D A056306 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 A056306 Sum mu(d)*A056298(n/d) where d|n. Alternatively, A056301(n)-A056300(n).. %Y A056306 Column 5 of A107424. %Y A056306 Cf. A056290. %K A056306 nonn %O A056306 1,6 %A A056306 _Marks R. Nester_