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A364617
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Number of tilings of a 7 X n rectangle using dominoes and trominoes (of any shape).
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2
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1, 3, 280, 17300, 1014847, 64589501, 3899306587, 239677657279, 14838250606222, 917767233766444, 56812094297072361, 3515556491898051237, 217564118890672344141, 13464237427858452248381, 833237119780106867168604, 51565577787288901875727255
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OFFSET
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0,2
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LINKS
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EXAMPLE
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a(1) = 3:
._. ._. ._.
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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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