Number of ways to place n nonattacking composite pieces rook + semi-rider[6,6] on an n X n chessboard.
A189848
Number of ways to place n nonattacking composite pieces rook + semi-rider[6,6] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =4920a(7) =37488a(8) =319644a(9) =3033264a(10) =31784280a(11) =364902480a(12) =4509620040a(13) =59768680032a(14) =847746532152
External references
- oeis: A189848