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A089957
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Number of chess positions that can be obtained in exactly one way in n plies.
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2
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1, 20, 400, 1862, 9825, 53516, 311642, 2018993, 12150635, 69284509, 382383387, 1994236773
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OFFSET
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0,2
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COMMENTS
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Definition: position = position with castling and en passant information, diagram = position without castling and en passant information.
The positions are taken from the sets that are counted in A083276.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,hard,more,fini
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AUTHOR
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EXTENSIONS
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a(11) from Peter Österlund on Feb 22 2013, verified by François Labelle on Jan 08 2017
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STATUS
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approved
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