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A079817 Number of positions that are exactly n moves from the starting position in the Roundy puzzle. 1
1, 9, 54, 261, 919, 1246, 378, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

This is the number of positions that can be reached in n moves from the start, but which cannot be reached in fewer than n moves.

A puzzle in the Rubik cube family. The total number of distinct positions is 2880. Here we count half-turn moves.

LINKS

Table of n, a(n) for n=0..7.

Jaap Scherphuis, Puzzle Pages

CROSSREFS

Cf. A079742.

Sequence in context: A059597 A282920 A023008 * A169796 A027472 A022637

Adjacent sequences:  A079814 A079815 A079816 * A079818 A079819 A079820

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane, Feb 20 2003

STATUS

approved

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Last modified March 21 12:12 EDT 2019. Contains 321369 sequences. (Running on oeis4.)