Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric under 180 degree rotation.
A143885
Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric under 180 degree rotation.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =15a(4) =52a(5) =383a(6) =2273a(7) =28764a(8) =295391a(9) =6544311a(10) =116636234
External references
- oeis: A143885