Number of ways to place 4n rooks on n X n board, 4 rooks in each row and each column, multiple rooks in a cell allowed, and exactly 4 rooks below the main diagonal.

A260584

Number of ways to place 4n rooks on n X n board, 4 rooks in each row and each column, multiple rooks in a cell allowed, and exactly 4 rooks below the main diagonal.

Terms

    a(0) =1a(1) =42a(2) =1152a(3) =22785a(4) =358784a(5) =4848569a(6) =59160195a(7) =674020718a(8) =7332379979a(9) =77311947872a(10) =798116114567

External references