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 A075208 #10 Dec 05 2014 02:18:05 %S A075208 0,0,0,0,0,0,1,1,14,30,88,929,989,3859,16557,35017,46506,256901, %T A075208 256721,1286189,2306003 %N A075208 Number of polyhexes with n cells that tile the plane by translation but not by 180-degree rotation (Conway criterion). %D A075208 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4. %H A075208 Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyhex tiling</a> %Y A075208 Cf. A070766, A075207, A075209, A075210, A075211, A075212, A075213, A075214, A075215, A075199, A075217. %K A075208 hard,nonn %O A075208 1,9 %A A075208 _Joseph Myers_, Sep 08 2002 %E A075208 More terms from _Joseph Myers_, Nov 08 2003 %E A075208 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007