%I #11 Feb 07 2017 17:27:05
%S 1,9157,657253434,58480141962875,5316709999497259059,
%T 484393789403397886429249,44141190389848159904786733934,
%U 4022519784390988451174562198889336,366566828291367228800261059891047626895,33404748935117787113145811582089363383972226
%N Number of tilings of a 7 X 4n rectangle with 7n tetrominoes of any shape.
%H Alois P. Heinz, <a href="/A232759/b232759.txt">Table of n, a(n) for n = 0..70</a>
%H S. Butler, J. Ekstrand, S. Osborne, <a href="/A230031/a230031.pdf">TETRIS Tiling</a>, AMS Spring Central Sectional, Iowa State University, April 27-28 2013
%H R. S. Harris, <a href="http://www.bumblebeagle.org/polyominoes/tilingcounting">Counting Polyomino Tilings</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Tetris">Tetris</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Tetromino">Tetromino</a>
%Y Quadrisection of column k=7 of A230031.
%K nonn
%O 0,2
%A _Alois P. Heinz_, Nov 29 2013
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