combinatorics - How many different ways can we place 4 identical rooks on the following chess board - Mathematics Stack Exchange

How many different ways can we place 4 identical rooks on the following chess board so that no two of them attack each other? I know when the board is $n \times n$ and we have $n$ towers then the

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combinatorics - Independence problem: one rook and maximum number of knights on the chessboard $8 imes 8$ - Mathematics Stack Exchange

How many ways can a black rook and a white rook be placed on different squares of a chess board such that neither is attacking the other? - Quora