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 A124903 #7 Mar 12 2020 05:28:13 %S A124903 2,12,30,240,720,60480,60480,7983360,1108800,518918400,21794572800, %T A124903 62270208000,87178291200,35568742809600,2,40548366802944000, %U A124903 304112751022080000,851515702861824000,2534272925184000,5170403347776995328000,51704033477769953280000 %N A124903 a(n) = n!/A124901(n). %Y A124903 Cf. A124900, A124901, A124902. %K A124903 nonn %O A124903 5,1 %A A124903 _Artur Jasinski_, Nov 12 2006 %E A124903 More terms from the data at A124901 added by _Amiram Eldar_, Mar 12 2020