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 A224287 #26 Jul 17 2017 02:24:17 %S A224287 1,2,6,24,120,718,4956,38180,319280,2837959 %N A224287 Number of multiplicity free permutations in S_n, i.e., permutations whose Stanley symmetric function is multiplicity free. %C A224287 This family is conjectured to be characterized by a finite set of patterns up to S_11. %H A224287 S. Billey and B. Pawlowski, <a href="https://arxiv.org/abs/1304.7870">Permutation Patterns, Stanley symmetric functions and generalized Specht modules</a>, arXiv:1304.7870 [math.CO], 2013. %Y A224287 Cf. A005802, A223905, A224318. %K A224287 nonn,more %O A224287 1,2 %A A224287 _Sara Billey_, Apr 04 2013