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A263425
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Number of tilings of an 2n X 2n square using tetrominoes of any shape.
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1
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..5.
S. Butler, J. Ekstrand, S. Osborne, TETRIS Tiling, AMS Spring Central Sectional, Iowa State University, April 27-28 2013
R. S. Harris, Counting Polyomino Tilings
Wikipedia, Tetromino
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FORMULA
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a(n) = A230031(2n,2n).
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CROSSREFS
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Bisection (even part) of main diagonal of A230031.
Cf. A004003.
Sequence in context: A079196 A113798 A151593 * A066923 A039556 A095627
Adjacent sequences: A263422 A263423 A263424 * A263426 A263427 A263428
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KEYWORD
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nonn,more
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AUTHOR
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Alois P. Heinz, Oct 17 2015
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STATUS
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approved
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