A143888 Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric under horizontal and vertical reflection.
1, 2, 1, 11, 4, 101, 29, 1592, 263, 43578, 4424, 1972239, 117557, 159790891, 5394252, 22035879309, 430235439
Offset: 0