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%I #8 Dec 07 2012 12:52:47
%S 1,1,2,8,21,65,267,804,2530,9407,29876,96530,337607,1100968,3612017,
%T 12284181,40538721,133971666,450045654,1492504271,4949649998,
%U 16537407509,54951656907,182545459254,608458757050,2023395434235,6727009100372,22399013790607
%N Number of tilings of a 6 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.
%H Alois P. Heinz, <a href="/A219970/b219970.txt">Table of n, a(n) for n = 0..600</a>
%e a(2) = 2, because there are 2 tilings of a 6 X 2 rectangle using straight (3 X 1) trominoes and 2 X 2 tiles:
%e ._._. .___.
%e | | | | |
%e | | | |___|
%e |_|_| | |
%e | | | |___|
%e | | | | |
%e |_|_| |___|
%Y Column k=6 of A219967.
%K nonn
%O 0,3
%A _Alois P. Heinz_, Dec 02 2012