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 A056368 #9 Aug 22 2017 20:53:09 %S A056368 0,0,0,1,2,11,33,136,478,1849,6845,26136,98406,373977,1416249,5380770, %T A056368 20440250,77794939,296384565,1131009781,4321964735,16541268223, %U A056368 63400061153,243358777620,935431121460,3600520732809 %N A056368 Number of primitive (period n) bracelet structures using exactly four different colored beads. %C A056368 Turning over will not create a new bracelet. Permuting the colors of the beads will not change the structure. %D A056368 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 A056368 A056363(n)-A056362(n). %Y A056368 Column 4 of A276543. %Y A056368 Cf. A056305. %K A056368 nonn %O A056368 1,5 %A A056368 _Marks R. Nester_