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 A327015 #11 Sep 04 2019 03:59:12 %S A327015 1,1,3,8,28,98,518,3096,23415,201795,1973189,21347935,253282652, %T A327015 3263902430 %N A327015 Number of equivalence classes of pairs of permutations in S_n where two pairs are equivalent if they are simultaneously conjugate to each other or simultaneously conjugate to each other after a reversal of one pair. %H A327015 Amit Harlev, Charles R. Johnson, and Derek Lim, <a href="https://arxiv.org/abs/1908.03647">The Doubly Stochastic Single Eigenvalue Problem: A Computational Approach</a>, arXiv:1908.03647 [math.SP], 2019. %F A327015 a(n) = (A110143(n) + A327014(n)) / 2. %e A327015 For n = 2, representatives of the a(2) = 3 classes are: (e,e), (e, (12)), ((12),(12)), where e is identity. %Y A327015 Cf. A110143, A327014. %K A327015 nonn,more %O A327015 0,3 %A A327015 _Derek Lim_, Aug 13 2019