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 A127686 #5 Sep 07 2015 14:12:55 %S A127686 0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,1,2,2,5,4,8,9,15,16,27,30,46,55,80, %T A127686 96,139,168,237,293,403,503,687,864,1164,1477,1974,2516,3348,4282, %U A127686 5668,7284,9604,12374,16279,21022,27597,35718,46819,60693,79480,103174 %N A127686 Number of non-isomorphic maximal independent sets of the n-cycle graph having no symmetry axis. %C A127686 Number of non-isomorphic (i.e. defined up to a rotation and a reflection) maximal independent sets of the n-cycle graph having no symmetry axis. Also: Number of cyclic and non-palindromic compositions of n in which each term is either 2 or 3, where a clockwise writing is not distinguished from its counterclockwise counterpart. %H A127686 R. Bisdorff and J.-L. Marichal, <a href="http://arXiv.org/abs/math.CO/0701647">Counting non-isomorphic maximal independent sets of the n-cycle graph</a>, arXiv:0701647 (2007) and <a href="https://cs.uwaterloo.ca/journals/JIS/VOL11/Marichal/marichal.html">JIS 11 (2008) 08.5.7</a>. %F A127686 a(n) = Sum(d divides n) A127683(d) = A127685(n) - A127682(n) %Y A127686 Cf. A127682, A127683, A127685. %K A127686 easy,nonn %O A127686 1,19 %A A127686 Jean-Luc Marichal (jean-luc.marichal(AT)uni.lu), Jan 24 2007