Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about both diagonal and antidiagonal.
A143873
Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about both diagonal and antidiagonal.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =5a(4) =8a(5) =21a(6) =53a(7) =158a(8) =503a(9) =2181a(10) =9658a(11) =53517a(12) =313683a(13) =2389270
External references
- oeis: A143873