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 A007927 #6 Sep 19 2012 15:19:17 %S A007927 10,20,42,60,100,102,200,201,204,207,210,240,270,402,420,600,702,1000, %T A007927 1002,1020,1200,2000,2001,2004,2007,2010,2040,2070,2100,2400,2700, %U A007927 4002,4005,4020,4050,4200,4500,5004,5400,6000,7002,7020,7200 %N A007927 Some nontrivial permutation of digits is a factorial number. %H A007927 F. Smarandache, <a href="http://www.gallup.unm.edu/~smarandache/OPNS.pdf">Only Problems, Not Solutions!</a> %K A007927 nonn,base %O A007927 1,1 %A A007927 R. Muller