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 A064267 #6 Jul 14 2012 10:56:35 %S A064267 26,15,34,23,12,31,20,39,28,17,36,25,14,33,22,11,30,19,38 %N A064267 Clavis terminorum in Julian calendar for a year with Golden Number n. %D A064267 B. Blackburn and L. Hollford-Stevens, The Oxford Companion to the Year, Oxford, 1999; see p. 821. %H A064267 Eric Weisstein's World of Astronomy, <a href="http://scienceworld.wolfram.com/astronomy/GoldenNumber.html">Golden Number</a> %H A064267 <a href="/index/Ca#calendar">Index entries for sequences related to calendars</a> %K A064267 nonn,fini,full %O A064267 1,1 %A A064267 _N. J. A. Sloane_, Sep 24 2001