Number of ways to place n nonattacking composite pieces rook + rider[1,6] on an n X n chessboard.

A189853

Number of ways to place n nonattacking composite pieces rook + rider[1,6] on an n X n chessboard.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =2640a(7) =13596a(8) =87768a(9) =680274a(10) =6090756a(11) =61678252a(12) =482005340a(13) =4454053680a(14) =46705656280a(15) =549750105234

External references