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A194648
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Number of ways to place 6n nonattacking kings on a 12 X 2n cylindrical chessboard.
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3
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448, 1732, 7918, 39316, 205628, 1118398, 6286658, 36383284, 216134044, 1314160492, 8155899320, 51526819510, 330559583178, 2148524237842, 14120142260138, 93669254201140, 626289974615094, 4215364545901036, 28531464984810918, 194028126730583796
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OFFSET
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1,1
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COMMENTS
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This cylinder is horizontal: a chessboard where it is supposed that rows 1 and 2n are in contact (number of columns = 12, number of rows = 2n).
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LINKS
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FORMULA
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Asymptotic: a(n) ~ 2*7^n.
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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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