Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #9 Nov 28 2016 00:37:44
%S 1,0,4,19,70,456,2530,12343,66653,372429,1910822,10162059,55583124,
%T 291195073,1550518247,8363883923,44269140576,235940940726,
%U 1264437357202,6723179849519,35846240541026,191571690239220,1020536749613565,5442225134864810,29051213879574079
%N Number of tilings of an 8 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.
%H Alois P. Heinz, <a href="/A219972/b219972.txt">Table of n, a(n) for n = 0..100</a>
%e a(2) = 4, because there are 4 tilings of an 8 X 2 rectangle using straight (3 X 1) trominoes and 2 X 2 tiles:
%e .___. .___. .___. .___.
%e | | | | | | | | | |
%e |___| |___| | | | | | |
%e | | | | | |_|_| |_|_|
%e |___| | | | | | | | |
%e | | |_|_| |___| | | |
%e |___| | | | | | | |_|_|
%e | | | | | | | | | |
%e |___| |_|_| |_|_| |___|
%Y Column k=8 of A219967.
%K nonn
%O 0,3
%A _Alois P. Heinz_, Dec 02 2012