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A129551
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Number of ways to place n+2 queens and 2 pawns on an n X n board so that no two queens attack each other.
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1
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0, 0, 0, 0, 0, 0, 4, 44, 280, 1304, 12452, 105012, 977664, 9239816, 90776620, 897446092
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OFFSET
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1,7
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LINKS
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EXAMPLE
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a(4)=0 because when 6 queens are placed on a 4 X 4 board, at least two queens will be adjacent and therefore mutually attacking.
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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R. Douglas Chatham (d.chatham(AT)moreheadstate.edu), Apr 20 2007
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STATUS
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approved
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