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A090051
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Number of chess diagrams that can be obtained in exactly one way in n plies. This is also the number of dual-free proof games in n plies.
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3
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1, 20, 400, 1862, 9373, 51323, 298821, 1965313, 11759158, 66434263, 365037821
(list; graph; refs; listen; history; internal format)
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