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A136257 Number of possible plays on the n-th move in Mirror Chess in which Black's play is always the mirror image of White (White must either mate or play such that Black can mirror the move). 2
1, 20, 437, 10461, 270726, 7456194, 215666696, 6485151199, 201183083017, 6401210746834, 207969967925893, 6875935591529309 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

By the number of possible plays on the n-th move is meant the total number of legal lines of play for white under the rules of mirror chess at a depth of n moves from the standard initial position.

If white cannot play a legal move under the rules of mirror chess then the game is considered to be a draw.

LINKS

Table of n, a(n) for n=0..11.

Jeremy Gardiner, Mirror Chess

Jeremy Gardiner, Mirror Chess 3 moves supplied by Francois Labelle

CROSSREFS

Cf. A048987.

Sequence in context: A180810 A109116 A190922 * A320765 A099278 A276452

Adjacent sequences:  A136254 A136255 A136256 * A136258 A136259 A136260

KEYWORD

nonn,hard,more,fini

AUTHOR

Jeremy Gardiner, Apr 18 2008

EXTENSIONS

a(2) corrected and a(3) from Jeremy Gardiner, Mar 03 2013

a(3) corrected and a(4)-a(11) from Fran├žois Labelle, Apr 12 2015

STATUS

approved

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Last modified July 10 12:53 EDT 2020. Contains 335576 sequences. (Running on oeis4.)