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April 28th, 2012, 09:17
The number of ways to place n diagonally symmetric rooks on an n n chessboard in such a way that no two rooks attack each other is a telephone number.

Which doesn't mean it's a telephone number, of course.

pibbur who is and will always be in Pibbur ({pibburN;N in {strings}}
.. several species of small furry animals gathered together in a cave.

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