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Number of polyhexes with n cells that tile the plane.
12

%I #8 Mar 30 2012 17:28:41

%S 1,1,3,7,22,77,294,1054,3788,11326,24790,103641,164559,532510,1574252,

%T 2939898,4761009,21048218,24306306,95707819,205176450

%N Number of polyhexes 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/">Polyhex tiling</a>

%Y Cf. A000228-A070767, A018190-A070768, cf. A054359.

%K hard,nonn

%O 1,3

%A _Joseph Myers_, May 05 2002

%E More terms from _Joseph Myers_, Nov 06 2003

%E a(20) and a(21) from _Joseph Myers_, Nov 17 2010