Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric about main diagonal.
A143878
Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric about main diagonal.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =92a(5) =581a(6) =4989a(7) =54250a(8) =776877a(9) =14503255a(10) =356467268a(11) =11553201879a(12) =495106836021
External references
- oeis: A143878