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A089957
Number of chess positions that can be obtained in exactly one way in n plies.
2
1, 20, 400, 1862, 9825, 53516, 311642, 2018993, 12150635, 69284509, 382383387, 1994236773
OFFSET
0,2
COMMENTS
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.
CROSSREFS
Sequence in context: A208559 A209080 A090051 * A267718 A207402 A207751
KEYWORD
nonn,hard,more,fini
AUTHOR
François Labelle, Jan 12 2004
EXTENSIONS
a(9) from François Labelle, Mar 09 2004
a(10) from Arkadiusz Wesolowski, Jan 04 2012
a(11) from Peter Österlund on Feb 22 2013, verified by François Labelle on Jan 08 2017
STATUS
approved