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A247741
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Total number of U shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.
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2
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0, 0, 0, 18, 144, 1196, 10122, 92280, 821038, 6991890, 58992846, 496243152, 4159529298, 34612046520, 286233965312, 2357133355050, 19343135795244, 158206906810656, 1289891352293998, 10487551431195780, 85061169561727062, 688372469609962898, 5559403964257012514
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OFFSET
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0,4
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LINKS
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FORMULA
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CROSSREFS
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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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