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 A074115 #10 Jul 12 2017 09:15:50 %S A074115 1,1,1,2,6,20,120,420,2688,18144,120960,1330560,7983360,103783680, %T A074115 1037836800,12454041600,149448499200,1693749657600,30487493836800, %U A074115 289631191449600,5792623828992000,121645100408832000,2676192208994304000,30776210403434496000 %N A074115 a(n) = n!/A000793(n). %H A074115 Alois P. Heinz, <a href="/A074115/b074115.txt">Table of n, a(n) for n = 0..458</a> %Y A074115 Cf. A074859. %K A074115 nonn %O A074115 0,4 %A A074115 _Vladeta Jovovic_, Sep 16 2002 %E A074115 a(0)=1 prepended by _Alois P. Heinz_, Jul 12 2017