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