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 A337526 #15 Sep 25 2020 11:52:44 %S A337526 1,2,5,15,50,180,686,2731 %N A337526 Number of length n permutations that are sorted to the identity by a consecutive-213-avoiding stack followed by a classical-21-avoiding stack. %H A337526 C. Defant and K. Zheng, <a href="https://arxiv.org/abs/2008.12297">Stack-Sorting with Consecutive-Pattern-Avoiding Stacks</a>, arXiv:2008.12297 [math.CO], 2020. %e A337526 For n = 3, the permutations 123, 213, 231, 312, and 321 are correctly sorted to the identity while the permutation 132 is not. %Y A337526 Cf. A000108, A001006, A002026, A011782, A202062, A294790. %K A337526 nonn,more %O A337526 1,2 %A A337526 _Kai Zheng_, Aug 30 2020