Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric under 90-degree rotation.
A143892
Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric under 90-degree rotation.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =5a(4) =6a(5) =29a(6) =47a(7) =300a(8) =665a(9) =5276a(10) =15554a(11) =160307a(12) =632041a(13) =8448701a(14) =44021226
External references
- oeis: A143892