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Number of tilings of a 9 X n rectangle using 1 X 1 squares and L-tiles.
2

%I #7 Aug 25 2013 17:10:52

%S 1,1,55,595,11012,168925,2760690,44159095,711479843,11435477118,

%T 183947396032,2958142131138,47575298963072,765124447990418,

%U 12305134306097753,197897152964385186,3182680323964197938,51185438892782012288,823189555932846017125

%N Number of tilings of a 9 X n rectangle using 1 X 1 squares and L-tiles.

%C An L-tile is a 2 X 2 square with the upper right 1 X 1 subsquare removed and no rotations are allowed.

%H Alois P. Heinz, <a href="/A226543/b226543.txt">Table of n, a(n) for n = 0..500</a>

%H Alois P. Heinz, <a href="/A226543/a226543.txt">G.f. for A226543</a>

%Y Column k=9 of A226444.

%K nonn

%O 0,3

%A _Alois P. Heinz_, Jun 10 2013