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Using 16 black pawns and 16 white pawns, how many ways can we place 16 pawns into the 4x4 chessboard, where each pawn is occupying 1 cell, such that in each row and in each column the number of white pawns is even? 用16个黑棋和16个白棋，在4×4的棋盘上，每个棋子占1格，使每行和每列的白棋数量为偶数，我们可以用多少种方法放置16个棋子？ |
