Number of different ways one can attack all squares on an n X n chessboard with n rooks.

A248744

Number of different ways one can attack all squares on an n X n chessboard with n rooks.

Terms

    a(0) =1a(1) =1a(2) =6a(3) =48a(4) =488a(5) =6130a(6) =92592a(7) =1642046a(8) =33514112a(9) =774478098a(10) =19996371200a(11) =570583424422

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