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 A286111 #4 May 02 2017 14:01:37 %S A286111 1,1,1,3,2,5,6,10,11,21,29,58,78,144,224,421,648,1185,1990,3668,6095, %T A286111 11079,19098,34891 %N A286111 Number of distinct printable hexaflexagons of length n. %H A286111 Marshall Hampton, <a href="https://arxiv.org/abs/1704.07775">Constructing and Counting Hexaflexagons</a>, arXiv:1704.07775 [math.CO], 2017. %Y A286111 Cf. A007282, A286110. %K A286111 nonn,more %O A286111 3,4 %A A286111 _Michel Marcus_, May 02 2017