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Search: id:A089957
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A089957 Number of chess positions that can be obtained in exactly one way in n plies. +0
3
1, 20, 400, 1862, 9825, 53516, 311642, 2018993, 12150635, 69284509 (list; graph; listen)
OFFSET

0,2

COMMENT

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: A158534 A075843 A090051 this_sequence A019319 A083276 A057745

Adjacent sequences: A089954 A089955 A089956 this_sequence 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

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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