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 A075205 #14 Feb 16 2025 08:32:47 %S A075205 1,1,2,5,12,35,104,342,1041,3026,6512,23227,38238,108204,278426, %T A075205 544635,825654,3049903,3375582,12108377,21899125,36960289,53317222, %U A075205 220706640,271264826 %N A075205 Number of polyominoes with n cells that tile the plane isohedrally. %C A075205 A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally. %D A075205 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4. %H A075205 Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyomino tiling</a> %H A075205 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IsohedralTiling.html">Isohedral Tiling</a> %Y A075205 Cf. A054359, A075198, A075199, A075200, A075201, A075202, A075203, A075204, A075206, A075214, A075223. %K A075205 hard,nonn %O A075205 1,3 %A A075205 _Joseph Myers_, Sep 08 2002 %E A075205 More terms from _Joseph Myers_, Nov 04 2003 %E A075205 a(24) and a(25) from _Joseph Myers_, Nov 17 2010