A089957 - OEIS

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A089957

Number of chess positions that can be obtained in exactly one way in n plies.

1, 20, 400, 1862, 9825, 53516, 311642, 2018993, 12150635, 69284509, 382383387 (list; graph; refs; listen; history; internal format)

	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.`
	LINKS	`F. Labelle, Statistics on chess positions` `Index entries for sequences related to number of chess games`
	CROSSREFS	`Cf. A083276, A090044.` `Sequence in context: A171325 A075843 A090051 * A207127 A206938 A188603` `Adjacent sequences: A089954 A089955 A089956 * A089958 A089959 A089960`
	KEYWORD	`nonn,hard`
	AUTHOR	`Francois Labelle (flab(AT)cs.berkeley.edu), Jan 12 2004`
	EXTENSIONS	`a(9) from Francois Labelle (flab(AT)cs.berkeley.edu), Mar 09 2004` `a(10) from Arkadiusz Wesolowski, Jan 04 2012`

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.