Number of ways to place n nonattacking composite pieces rook + rider[5,5] on an n X n chessboard.

A189841

Number of ways to place n nonattacking composite pieces rook + rider[5,5] on an n X n chessboard.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =672a(6) =4128a(7) =28992a(8) =231936a(9) =2088960a(10) =20017152a(11) =207208704a(12) =2326900992a(13) =28338241536a(14) =373152276480

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