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 A335793 #14 Jul 08 2020 20:40:52 %S A335793 1,1,3,11,41,151,553,2023,7401 %N A335793 Number of hare pop-stack sortable Cayley permutations. %C A335793 Also, the set of Cayley permutations avoiding 231, 312, and 2121. %H A335793 Giulio Cerbai, <a href="https://arxiv.org/abs/2003.02536">Sorting Cayley permutations with pattern-avoiding machines</a>, arXiv:2003.02536 [math.CO], 2020. See p. 16. %F A335793 Conjectures from _Colin Barker_, Jun 24 2020: (Start) %F A335793 G.f.: (1 - 4*x + 4*x^2 - 2*x^3) / (1 - 5*x + 6*x^2 - 4*x^3). %F A335793 a(n) = 5*a(n-1) - 6*a(n-2) + 4*a(n-3) for n>3. %F A335793 (End) %Y A335793 Cf. A000670, A226316. %K A335793 nonn,more %O A335793 0,3 %A A335793 _Michael De Vlieger_, Jun 23 2020 %E A335793 a(7)-a(8) from Giulio Cerbai via _Michael De Vlieger_, Jun 24 2020