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 A358648 #17 Dec 12 2022 06:03:31
%S A358648 1,1296,2985984000000,416336312719673760153600000000,
%T A358648 39594086612242519324387557078266845776303882240000000000,
%U A358648 16363214235219603423192858350259453436046713251360764276842772299776000000000000000000000000
%N A358648 Number of preference profiles of the stable roommates problem with 2n participants.
%C A358648 Each participant ranks all participants other than themselves in strict order, giving (2n-1)! orderings for each of 2n participants.
%H A358648 Wikipedia, <a href="https://en.wikipedia.org/wiki/Stable_roommates_problem">Stable Roommates Problem</a>
%F A358648 a(n) = (2n-1)!^(2n).
%t A358648 Table[(2n-1)!^(2n), {n, 1, 6}]
%Y A358648 Cf. A356584 (up to isomorphism), A185141 (Stable Marriage profiles), A001147 (possible roommate pairings).
%Y A358648 Even bisection of A091868.
%K A358648 nonn,easy
%O A358648 1,2
%A A358648 _Dan Eilers_, Nov 24 2022