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Number of tilings of a 7 X n rectangle using monominoes and trominoes of any shape.
2

%I #6 Feb 06 2017 12:32:58

%S 1,9,1371,148796,15913695,1707101599,184140417890,19823918037604,

%T 2133436326533143,229681994753502100,24725866354382952217,

%U 2661724100255128134369,286536699674194768262220,30845921492404301091244774,3320584102598070051873302366

%N Number of tilings of a 7 X n rectangle using monominoes and trominoes of any shape.

%H Alois P. Heinz, <a href="/A270067/b270067.txt">Table of n, a(n) for n = 0..500</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Tromino">Tromino</a>

%Y Column k=7 of A270061.

%K nonn

%O 0,2

%A _Alois P. Heinz_, Mar 09 2016