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 A070767 #9 Mar 30 2012 17:28:41 %S A070767 0,0,0,0,0,5,39,394,2784,19164,118762,579460,3110267,15264387, %T A070767 75007623,369928203,1817475619,8913862144,43914857957,216555328193, %U A070767 1070588132492 %N A070767 Number of polyhexes with n cells that do not tile the plane. %D A070767 M. Gardner, Tiling with Polyominoes, Polyiamonds and Polyhexes. Chap. 14 in Time Travel and Other Mathematical Bewilderments. New York: W. H. Freeman, pp. 175-187, 1988. %H A070767 Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyhex tiling</a> %Y A070767 Cf. A000228, A070766, A038144, A070768, A054360. %K A070767 hard,nonn %O A070767 1,6 %A A070767 _Joseph Myers_, May 05 2002 %E A070767 More terms from _Joseph Myers_, Nov 06 2003 %E A070767 a(20) and a(21) from _Joseph Myers_, Nov 21 2010