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, 1994236773

Offset: 0

Author

François Labelle, Jan 12 2004

Keywords

• nonn
• hard
• more
• fini

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
• P. Österlund, Computation of a(11).
• Index entries for sequences related to number of chess games

Crossrefs

Cf. A083276, A090051.

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