Number of ways to place n nonattacking composite pieces queen + rider[1,4] on an n X n chessboard.
A189874
Number of ways to place n nonattacking composite pieces queen + rider[1,4] on an n X n chessboard.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =0a(6) =0a(7) =4a(8) =8a(9) =28a(10) =100a(11) =186a(12) =624a(13) =1720a(14) =7288a(15) =30666a(16) =100220a(17) =360208a(18) =1517804a(19) =7302336a(20) =29429672a(21) =139854636a(22) =753288744
External references
- oeis: A189874