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A197160 Number of fixed poly-[3^4.6]-tiles (holes allowed) with n cells. 1

%I

%S 6,15,44,141,480,1703,6216,23136,87334,333309,1283706,4982458,

%T 19466130,76479612,301923554

%N Number of fixed poly-[3^4.6]-tiles (holes allowed) with n cells.

%D Branko Gr├╝nbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4.

%Y Cf. A197159.

%K hard,nonn

%O 1,1

%A _Joseph Myers_, Oct 10 2011

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Last modified June 24 21:50 EDT 2021. Contains 345433 sequences. (Running on oeis4.)