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 A326761 #7 Aug 14 2019 07:51:02 %S A326761 1,2,5,12,28,70,171,428,1062,2664,6664,16744,42018 %N A326761 Number of 321-avoiding permutations of length n whose squares also avoid the pattern 321. %H A326761 Miklos Bona and Rebecca Smith, <a href="https://arxiv.org/abs/1901.00026">Pattern Avoidance in Permutations and Their Squares</a>, arXiv:1901.00026 [math.CO], 2019. %H A326761 Amanda Burcroff and Colin Defant, <a href="https://arxiv.org/abs/1907.09451">Pattern-Avoiding Permutation Powers</a>, arXiv:1907.09451 [math.CO], 2019. %Y A326761 Cf. A326760, A326762, A326763. %K A326761 nonn,more %O A326761 1,2 %A A326761 _Amanda Burcroff_, Jul 23 2019