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A124997
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Number of fault-free domino tilings (or dimer coverings) of a 2n X 2n square.
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3
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0, 0, 0, 25506, 1759280998, 854818404562894, 3588226034666378581610, 138311081613064367684548901556, 50272239752141442901464758051467073726, 174927321882862834702052846250836696969014873138, 5889117928937174007411459040006660524033737246962655301188
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OFFSET
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1,4
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COMMENTS
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Enumerates a subclass of the things counted by A004003.
"Fault-free" means that every straight line through the interior of the square hits the interior of some domino.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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