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%I #20 Jun 27 2012 10:28:45
%S 1,3,13,44,186,820,3652,16689,77383,362671,1716033,8182315,39267086,
%T 189492795
%N Number of free poly-IH7-tiles (holes allowed) with n cells
%C Equivalently, one-sided poly-IH16-tiles.
%D Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
%Y Cf. A213951.
%K hard,more,nonn
%O 1,2
%A _Joseph Myers_, Jun 26 2012
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