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 A061710 #5 Oct 13 2013 08:45:36 %S A061710 1,1,4,168,130560,2778096640,2182547233161216,80604526437978334298112, %T A061710 171350523619928085051880067039232, %U A061710 24958704994164739282319189442326176511033344 %N A061710 Number of maximal chains in the Bruhat order of S_n. %D A061710 Humphreys, James E., Reflection groups and Coxeter groups. Cambridge Studies in Advanced Mathematics, 29. Cambridge University Press, Cambridge, 1990. %K A061710 nice,nonn %O A061710 1,3 %A A061710 _Sara Billey_, Jun 20 2001 %E A061710 a(8), a(9) added by _Tomas Boothby_, Aug 24 2009