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 A251617 Number of tilings of a 5 X n rectangle using n pentominoes of shapes F, I, L, U. 3

%I

%S 1,1,3,5,19,74,219,628,1749,5486,17448,53383,160169,479908,1468366,

%T 4512092,13782535,41855766,127112554,387469920,1182800866,3606789463,

%U 10983721059,33445214911,101911804705,310658892951,946813182854,2884825285301,8789233684468

%N Number of tilings of a 5 X n rectangle using n pentominoes of shapes F, I, L, U.

%H Alois P. Heinz, <a href="/A251617/b251617.txt">Table of n, a(n) for n = 0..1000</a>

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

%e a(4) = 19 = 13 + 4 + 2 = A249762(4) + 4 + 2:

%e ._______. ._______.

%e |_____. | | ._____|

%e | | ._|_| |_| ._. |

%e | | |_. | | |_| |_|

%e | |___| | |_____| |

%e |___|___| (4) |_______| (2) .

%Y Cf. A174249, A233427, A247443, A247680, A249762, A251737.

%K nonn

%O 0,3

%A _Alois P. Heinz_, Dec 05 2014

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Last modified November 23 16:18 EST 2020. Contains 338590 sequences. (Running on oeis4.)