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A143882
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Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric under horizontal reflection.
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1
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1, 2, 3, 29, 48, 1401, 1825, 183270, 194391, 76221979, 59133738, 86201358557, 54181631319, 318503225414986, 146475713866791
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OFFSET
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0,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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