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 A326760 #6 Aug 14 2019 07:52:03 %S A326760 1,2,5,12,28,70,161,386,932,2226,5254,12748,30228,72192 %N A326760 Number of permutations of length n whose powers all avoid the pattern 321. %H A326760 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 A326760 Cf. A326761, A326762, A326763. %K A326760 nonn,more %O A326760 1,2 %A A326760 _Amanda Burcroff_, Jul 23 2019