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 A075207 #11 Dec 05 2014 05:06:17 %S A075207 1,1,3,6,12,36,60,209,387,1054,1468,6895,7001,23920,49496,126732, %T A075207 146046,638800,647502,2772935,4162861 %N A075207 Number of polyhexes with n cells that tile the plane by translation. %D A075207 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4. %H A075207 Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyhex tiling</a> %Y A075207 Cf. A070766, A075208, A075209, A075210, A075211, A075212, A075213, A075214, A075215, A075198, A075216. %K A075207 hard,nonn %O A075207 1,3 %A A075207 _Joseph Myers_, Sep 08 2002 %E A075207 More terms from _Joseph Myers_, Nov 08 2003 %E A075207 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007