Number of ways to place n nonattacking composite pieces rook + rider[3,4] on an n X n chessboard.
A189858
Number of ways to place n nonattacking composite pieces rook + rider[3,4] on an n X n chessboard.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =80a(5) =326a(6) =1566a(7) =9544a(8) =53696a(9) =347382a(10) =2566892a(11) =21907934a(12) =184868860a(13) =1704360992a(14) =17294597926a(15) =192725663600
External references
- oeis: A189858