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%I A247443 #28 Feb 06 2017 18:12:34
%S A247443 1,0,2,0,6,16,32,104,186,800,1700,4836,11186,29940,84388,208808,
%T A247443 563364,1391664,3787510,9824684,25712276,66815444,173151378,457266220,
%U A247443 1188536784,3113743272,8087358736,21152284376,55283003950,144314582896,376852311434,982507243820
%N A247443 Number of tilings of a 5 X n rectangle using n pentominoes of shapes F, L, Y.
%H A247443 Alois P. Heinz, <a href="/A247443/b247443.txt">Table of n, a(n) for n = 0..1000</a>
%H A247443 Alois P. Heinz, <a href="/A247443/a247443.txt">G.f. and Maple program for A247443</a>
%H A247443 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a>
%F A247443 G.f.: see link.
%e A247443 a(5) = 16:
%e A247443 ._._______.        ._______._.
%e A247443 | | ._____|        |_. .___| |
%e A247443 | |_| ._| |        | |_| ._| |
%e A247443 | |_. |_. |        | |_. |_. |
%e A247443 |___|_| | |        | ._|_| |_|
%e A247443 |_______|_| (*8)   |_|_______| (*8)  .
%p A247443 # Maple program: see link.
%Y A247443 Cf. A174249, A233427, A234312, A234931, A247680, A248102, A249762.
%K A247443 nonn
%O A247443 0,3
%A A247443 _Alois P. Heinz_, Sep 23 2014

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