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 A289747 #24 Dec 05 2023 10:28:28 %S A289747 1,6,720,120960,2264371200,48920701648896000, %T A289747 1570969121006520000000000000 %N A289747 Erroneous version of A036981. %C A289747 Previous incorrect name was "Number of round-robin tournament schedules with 2*n participants." %K A289747 dead %O A289747 1,2 %A A289747 _Alexander Karpov_, Jul 11 2017