Number of ways to place n nonattacking composite pieces rook + rider[1,4] on an n X n chessboard.
A189851
Number of ways to place n nonattacking composite pieces rook + rider[1,4] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =48a(5) =182a(6) =868a(7) =5752a(8) =22952a(9) =131766a(10) =912964a(11) =7556978a(12) =52602390a(13) =432795244a(14) =4121203656a(15) =44335718598a(16) =416447624724
External references
- oeis: A189851