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%I #14 Dec 17 2024 15:33:08
%S 6,15,44,141,480,1703,6216,23136,87334,333309,1283706,4982458,
%T 19466130,76479612,301923554,1196919714,4762524162,19012433694
%N Number of fixed poly-[3^4.6]-tiles (holes allowed) with n cells.
%D Branko Grünbaum 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
%E a(16)-a(18) from _Johann Peters_, Dec 17 2024