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 A075210 #10 Dec 05 2014 02:18:22 %S A075210 0,0,0,1,9,39,197,721,2717,8211,19836,74497,132611,403534,1127416, %T A075210 2364402,4173316,15604400,21318428,73965916,154211880 %N A075210 Number of polyhexes with n cells that tile the plane by 180-degree rotation (Conway criterion) but not by translation. %D A075210 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4. %H A075210 Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyhex tiling</a> %Y A075210 Cf. A070766, A075207, A075208, A075209, A075211, A075212, A075213, A075214, A075215, A075201, A075219. %K A075210 hard,nonn %O A075210 1,5 %A A075210 _Joseph Myers_, Sep 08 2002 %E A075210 More terms from _Joseph Myers_, Nov 08 2003 %E A075210 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007