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 A193936 #18 Jun 14 2020 09:42:29 %S A193936 1,2,6,24,120,720,5040,40320,362856,3627385,39864333,477407104, %T A193936 6183182389,86033729930,1278515941177,20185987771091 %N A193936 5-nonnesting permutations. %C A193936 Also the number of 5-noncrossing permutations %H A193936 Sophie Burrill, Sergi Elizalde, Marni Mishna and Lily Yen, <a href="http://arxiv.org/abs/1108.5615">A generating tree approach to k-nonnesting partitions and permutations</a>, arXiv preprint arXiv:1108.5615 [math.CO], 2011-2014. %H A193936 S. Corteel, <a href="http://dx.doi.org/10.1016/j.aam.2006.01.006">Crossings and alignments of permutations</a>, Adv. Appl. Math 38 (2007) 149-163. %Y A193936 Cf. A193938, A193935, A193937. %K A193936 nonn,more %O A193936 1,2 %A A193936 _Lily Yen_, Aug 09 2011