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A212271
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Number of ways to place k non-attacking ferses on an n x n cylindrical chessboard, summed over all k >= 0.
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4
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2, 9, 80, 1600, 79033, 8156736, 2055960192, 1108756350625, 1411080429618656, 3943472747846953216, 25425527581172360096017, 365481944233773616212640000, 11980566143208960475692367828480, 882106482533191605447029340350009049, 147314997388032765439791110273770608260928
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OFFSET
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1,1
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COMMENTS
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Fers is a leaper [1,1].
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LINKS
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FORMULA
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Limit n ->infinity (a(n))^(1/n^2) is the hard square entropy constant A085850.
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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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