login
Number of tilings of a 5 X n rectangle using monominoes and trominoes of any shape.
2

%I #9 Feb 06 2017 12:31:59

%S 1,4,140,3710,96176,2501946,65410388,1707101599,44538604036,

%T 1162378878394,30334909910156,791636651386694,20659194865202206,

%U 539139829390310029,14069828639020139191,367177676400256677129,9582168262012437486944,250064069442551102774366

%N Number of tilings of a 5 X n rectangle using monominoes and trominoes of any shape.

%H Alois P. Heinz, <a href="/A270065/b270065.txt">Table of n, a(n) for n = 0..700</a>

%H Vaclav Kotesovec, <a href="/A270065/a270065.txt">Recurrence (of order 135) and g.f.</a>

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

%Y Column k=5 of A270061.

%K nonn

%O 0,2

%A _Alois P. Heinz_, Mar 09 2016