Number of ways to place n nonattacking composite pieces rook + rider[5,6] on an n X n chessboard.

A189863

Number of ways to place n nonattacking composite pieces rook + rider[5,6] on an n X n chessboard.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =4176a(7) =26140a(8) =185084a(9) =1491098a(10) =13285034a(11) =132514356a(12) =1321161252a(13) =14181339764a(14) =164574628260

External references