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 A071332 #7 Mar 30 2012 17:28:41 %S A071332 1,1,1,3,4,12,23,66,139,341,567,2034,2495,6354,12908,30261,26556, %T A071332 110145,95967,377523,499672,788726,845130,4998370,3694670,7406217, %U A071332 13175181,33557076,22381719,117770863 %N A071332 Number of polyiamonds with n cells that tile the plane. %D A071332 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 A071332 Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyiamond tiling</a> %Y A071332 Equals A000577-A071333 and equals A070765-A071334, cf. A054359, A070766. %K A071332 hard,nonn %O A071332 1,4 %A A071332 _Joseph Myers_, May 19 2002 %E A071332 More terms from _Joseph Myers_, Nov 11 2003 %E A071332 a(29) and a(30) from _Joseph Myers_, Nov 21 2010