Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under horizontal and vertical reflection.
A143877
Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under horizontal and vertical reflection.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =7a(4) =4a(5) =55a(6) =17a(7) =576a(8) =129a(9) =13243a(10) =1554a(11) =465675a(12) =35443a(13) =32233206a(14) =1330673a(15) =3746034675a(16) =92945020
External references
- oeis: A143877