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%I #11 Oct 08 2019 19:31:31
%S 4,6,12,25,56,132,320,792,1976,4962,12576,32140,82704,214044,556576,
%T 1453210,3808592,10015134,26413468,69844263
%N Number of fixed poly-[4.8^2]-tiles (holes allowed) with n cells (division into triangles is significant).
%D Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4.
%H Gill Barequet, Minati De, <a href="https://doi.org/10.1007/978-3-030-26176-4_2">A Lower Bound on the Growth Constant of Polyaboloes on the Tetrakis Lattice</a>, International Computing and Combinatorics Conference (COCOON 2019): Computing and Combinatorics, 13-24.
%Y Cf. A197465, A197466.
%K hard,nonn
%O 1,1
%A _Joseph Myers_, Oct 15 2011
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