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A233429
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Number of tilings of a 4 X 5n rectangle with 4n pentominoes of any shape.
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2
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1, 501, 890989, 1666772813, 3125064284901, 5859766228545967, 10987595369808657169, 20602741350971679371521, 38632014757792375332001835, 72438542874037975287077565935, 135828859204452470219311220073385, 254691470323770059993623356733063003
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) ~ c * d^n, where d = 1875.09099182186211660253860201132854810972459605757360689785461004..., c = 0.25279505771792803447854701369537504374767224177480509542292622525... . - Vaclav Kotesovec, Mar 05 2016
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CROSSREFS
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Quintisection of column k=4 of A233427.
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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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