%I #10 Dec 05 2014 02:52:10
%S 1,1,5,16,62,276,1222,5563,25805,120909,572011,2727485,13089106,
%T 63164265
%N Number of free poly-IH10-tiles (holes allowed) with n cells.
%C 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 Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
%Y Cf. A000228, A001207, A006535, A057973, A197550, A197551, A197552, A197553, A197554.
%K hard,nonn
%O 1,3
%A _Joseph Myers_, Oct 16 2011