A143882 Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric under horizontal reflection.
1, 2, 3, 29, 48, 1401, 1825, 183270, 194391, 76221979, 59133738, 86201358557, 54181631319, 318503225414986, 146475713866791
Offset: 0