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%I #9 Dec 24 2019 08:32:33
%S 1,64,9866,2078716,486248000,117656540512,28778500622048,
%T 7063448084710944,1735575086258267968,426602245391808219456,
%U 104870171042459607741312,25780811901305515395438592,6337913024506813766449064064,1558108119479642808250383381248,383044676600298851289615284801792
%N Number of tilings of a 7 X n rectangle using polyominoes of shape I.
%C A polyomino of shape I is a rectangle of width 1.
%H Andrew Howroyd, <a href="/A254607/b254607.txt">Table of n, a(n) for n = 0..200</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyomino">Polyomino</a>
%Y Column k=7 of A254414.
%K nonn
%O 0,2
%A _Alois P. Heinz_, Feb 02 2015
%E Terms a(11) and beyond from _Andrew Howroyd_, Dec 23 2019
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