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 A247849 #6 Oct 16 2014 14:22:55 %S A247849 11,12,14,15,16,17 %N A247849 Apollo missions that landed humans on the moon. %H A247849 NASA, <a href="http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo.html">The Apollo Program</a> %K A247849 nonn,fini,full %O A247849 1,1 %A A247849 _Ray G. Opao_, Sep 25 2014