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A195648
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Number of ways to place 9n nonattacking kings on a 18 x 2n chessboard.
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4
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5120, 1501674, 144605184, 7683664202, 282359109140, 8080813574550, 193194265398240, 4035559337688370, 75925129079783308, 1314578079936797520, 21279238303065874504, 325878859655043000344, 4765036384361599508980, 67005992305769489072298, 911373843678367079288192
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OFFSET
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1,1
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LINKS
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FORMULA
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Recurrence order is 548.
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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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