%I #12 Dec 05 2014 02:27:29
%S 1,2,7,24,99,416,1852,8386,38798,181531,858570,4092042,19636172,
%T 94750922
%N Number of free poly-IH9-tiles (holes allowed) with n cells.
%D Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
%K hard,nonn,more
%O 1,2
%A _Joseph Myers_, Jun 26 2012
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