Number of ways to place n nonattacking composite pieces rook + rider[2,5] on an n X n chessboard.
A189856
Number of ways to place n nonattacking composite pieces rook + rider[2,5] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =392a(6) =1810a(7) =10400a(8) =72228a(9) =589674a(10) =3823906a(11) =29420944a(12) =266232984a(13) =2711139976a(14) =30669073348a(15) =316482938974
External references
- oeis: A189856