Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under 180 degree rotation.
A143880
Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under 180 degree rotation.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =15a(4) =36a(5) =383a(6) =1505a(7) =28764a(8) =197391a(9) =6544311a(10) =74718810
External references
- oeis: A143880