Number of ways to place n nonattacking composite pieces queen + leaper[2,5] on an n X n chessboard.
A189869
Number of ways to place n nonattacking composite pieces queen + leaper[2,5] on an n X n chessboard.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =2a(4) =10a(5) =4a(6) =28a(7) =20a(8) =56a(9) =72a(10) =288a(11) =1304a(12) =6368a(13) =22884a(14) =125864a(15) =755412a(16) =4565572a(17) =29862256a(18) =207238124a(19) =1540506028a(20) =11774180220
External references
- oeis: A189869