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Number of one-sided poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).
2

%I #9 Jun 03 2022 11:17:08

%S 2,3,6,13,28,66,148,349,828,2005,4880,12043,29852,74645,187498,473448,

%T 1199630,3050554,7778234,19885465,50950796,130824763,336555890,

%U 867389312,2239220294,5789804688

%N Number of one-sided poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).

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

%Y Cf. A197462, A197464.

%K hard,nonn

%O 1,1

%A _Joseph Myers_, Oct 15 2011

%E a(20)-a(26) from _Aaron N. Siegel_, Jun 03 2022