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Number of tilings of a 7 X n rectangle using pentominoes of shapes W, U, X and monominoes.
2

%I #6 Feb 06 2017 12:39:56

%S 1,1,23,1086,13097,261110,5732276,105028302,2057123951,40750196324,

%T 789214306848,15416490294168,301533431477968,5881271193704355,

%U 114836714153318686,2242611029205195253,43780084385383228801,854790034707804119211,16689735991827528511674

%N Number of tilings of a 7 X n rectangle using pentominoes of shapes W, U, X and monominoes.

%H Alois P. Heinz, <a href="/A273477/b273477.txt">Table of n, a(n) for n = 0..775</a>

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

%Y Cf. A264765.

%K nonn

%O 0,3

%A _Alois P. Heinz_, May 23 2016