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 A075391 #4 Dec 05 2013 19:55:38 %S A075391 1,2,6,120,180,36288,6720,24710400,227026800,12108096000,121080960, %T A075391 197110116403200,67365043200,201490341212160000,1001829765736800000, %U A075391 850009620666286080000,2144384782848000,5991810785878910952960000 %N A075391 Product/n^n of n-th group in A075383. %F A075391 A075387(n)/(n^n) %Y A075391 Cf. A075383, A075384, A075385, A075386, A075387. %K A075391 nonn %O A075391 1,2 %A A075391 _Amarnath Murthy_, Sep 22 2002 %E A075391 More terms from _David Wasserman_, Jan 17 2005