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A247113
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Number of tilings of a 9 X 4n rectangle with 9n tetrominoes of any shape.
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2
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1, 179399, 517312744806, 2045387873615550415, 8355513115448789147187273, 34243737232278596352691552132065, 140387532129057613906130882433658669281, 575558645377903777492614229836093710424726422, 2359673678366714374809214450385908918997931183691473
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OFFSET
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0,2
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LINKS
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S. Butler, J. Ekstrand, S. Osborne, TETRIS Tiling, AMS Spring Central Sectional, Iowa State University, April 27-28 2013
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CROSSREFS
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Quadrisection of column k=9 of A230031.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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