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 A197954 #9 Aug 02 2023 15:48:22 %S A197954 2,12,30,240,720,60480,60480,7983360,1108800,518918400,21794572800, %T A197954 62270208000,87178291200,35568742809600,2,40548366802944000, %U A197954 304112751022080000,851515702861824000,2534272925184000,5170403347776995328000,51704033477769953280000 %N A197954 Duplicate of A124903. %Y A197954 Cf. A124901, A124902. %K A197954 dead %O A197954 5,1 %A A197954 _Artur Jasinski_, Oct 19 2011