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 A197549 #10 Dec 05 2014 02:52:10 %S A197549 1,1,5,16,62,276,1222,5563,25805,120909,572011,2727485,13089106, %T A197549 63164265 %N A197549 Number of free poly-IH10-tiles (holes allowed) with n cells. %C A197549 Equivalently, polyhexes where two polyhexes are considered equivalent if and only if they are related by a translation or a rotation of order 3. %D A197549 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4. %Y A197549 Cf. A000228, A001207, A006535, A057973, A197550, A197551, A197552, A197553, A197554. %K A197549 hard,nonn %O A197549 1,3 %A A197549 _Joseph Myers_, Oct 16 2011