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A213950 Number of free poly-IH9-tiles (holes allowed) with n cells. 0

%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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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)