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A143888
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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.
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1, 2, 1, 11, 4, 101, 29, 1592, 263, 43578, 4424, 1972239, 117557, 159790891, 5394252, 22035879309, 430235439
(list; graph; refs; listen; history; internal format)
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