The number of ways to place one pawn and n+1 nonattacking queens on an n X n chessboard, unchanged by 180-degree rotation.
A368061
The number of ways to place one pawn and n+1 nonattacking queens on an n X n chessboard, unchanged by 180-degree rotation.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =0a(8) =5a(9) =0a(10) =18a(11) =0a(12) =50a(13) =0a(14) =652a(15) =0a(16) =4260a(17) =0a(18) =25134a(19) =0a(20) =238098a(21) =0a(22) =2492304a(23) =0a(24) =25389294
External references
- oeis: A368061