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A212269
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Number of ways to place k non-attacking kings on an n X n cylindrical chessboard, summed over all k >= 0.
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6
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2, 5, 19, 205, 3011, 92875, 4763459, 459630701, 78223965193, 24270274906085, 13497818986883771, 13571363009654254429, 24562890586806439035377, 80199120146273882569630015, 471874707649862024071657639861, 5005895207027974222377733802848093
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OFFSET
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1,1
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REFERENCES
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S. R. Finch, Mathematical Constants, Cambridge, 2003, p. 343.
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LINKS
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FORMULA
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Limit n ->infinity (a(n))^(1/n^2) = 1.342643951124... (see A247413).
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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STATUS
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approved
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